diff --git a/components/chart/chart.js b/components/chart/chart.js
index 8ea7f31..b9e995e 100644
--- a/components/chart/chart.js
+++ b/components/chart/chart.js
@@ -3,10 +3,10 @@ import { View, FlatList } from 'react-native'
 import range from 'date-range'
 import { LocalDate } from 'js-joda'
 import Svg, { G } from 'react-native-svg'
-import { makeYAxisLabels, normalizeToScale, makeHorizontalGrid } from './y-axis'
+import { makeYAxisLabels, makeHorizontalGrid } from './y-axis'
 import nfpLines from './nfp-lines'
 import DayColumn from './day-column'
-import { getCycleDay, getCycleDaysSortedByDate, getAmountOfCycleDays } from '../../db'
+import { getCycleDaysSortedByDate, getAmountOfCycleDays } from '../../db'
 import styles from './styles'
 import { scaleObservable } from '../../local-storage'
 import config from '../../config'
@@ -24,20 +24,24 @@ export default class CycleChart extends Component {
   constructor(props) {
     super(props)
     this.state = {}
-    this.renderColumn = ({item, index}) => {
-      return (
-        <DayColumn
-          {...item}
-          index={index}
-          navigate={this.props.navigate}
-          symptomHeight={this.symptomHeight}
-          columnHeight={this.columnHeight}
-          chartHeight={this.state.chartHeight}
-          symptomRowSymptoms={this.symptomRowSymptoms}
-        />
-      )
-    }
     this.cycleDaysSortedByDate = getCycleDaysSortedByDate()
+    this.getFhmAndLtlInfo = nfpLines()
+  }
+
+  renderColumn = ({ item, index }) => {
+    return (
+      <DayColumn
+        dateString={item}
+        index={index}
+        navigate={this.props.navigate}
+        symptomHeight={this.symptomHeight}
+        columnHeight={this.columnHeight}
+        chartHeight={this.state.chartHeight}
+        symptomRowSymptoms={this.symptomRowSymptoms}
+        chartSymptoms={this.chartSymptoms}
+        getFhmAndLtlInfo={this.getFhmAndLtlInfo}
+      />
+    )
   }
 
   onLayout = ({ nativeEvent }) => {
@@ -67,12 +71,12 @@ export default class CycleChart extends Component {
         this.symptomHeight
       this.columnHeight = remainingHeight - this.symptomRowHeight
 
-      const chartSymptoms = [...this.symptomRowSymptoms]
+      this.chartSymptoms = [...this.symptomRowSymptoms]
       if (this.cycleDaysSortedByDate.some(day => day.temperature)) {
-        chartSymptoms.push('temperature')
+        this.chartSymptoms.push('temperature')
       }
 
-      const columnData = this.makeColumnInfo(nfpLines(), chartSymptoms)
+      const columnData = this.makeColumnInfo()
       this.setState({ columns: columnData })
     }
 
@@ -85,7 +89,7 @@ export default class CycleChart extends Component {
     this.removeObvListener()
   }
 
-  makeColumnInfo(getFhmAndLtlInfo, chartSymptoms) {
+  makeColumnInfo() {
     let amountOfCycleDays = getAmountOfCycleDays()
     // if there's not much data yet, we want to show at least 30 days on the chart
     if (amountOfCycleDays < 30) {
@@ -95,59 +99,13 @@ export default class CycleChart extends Component {
       amountOfCycleDays += 5
     }
     const jsDates = getTodayAndPreviousDays(amountOfCycleDays)
-    const xAxisDates = jsDates.map(jsDate => {
+    return jsDates.map(jsDate => {
       return LocalDate.of(
         jsDate.getFullYear(),
         jsDate.getMonth() + 1,
         jsDate.getDate()
       ).toString()
     })
-
-    const columns = xAxisDates.map(dateString => {
-      const column = { dateString }
-      const cycleDay = getCycleDay(dateString)
-      let symptoms = {}
-
-      if (cycleDay) {
-        symptoms = chartSymptoms.reduce((acc, symptom) => {
-          if (symptom === 'bleeding' ||
-          symptom === 'temperature' ||
-          symptom === 'mucus' ||
-          symptom === 'desire' ||
-          symptom === 'note'
-          ) {
-            acc[symptom] = cycleDay[symptom] && cycleDay[symptom].value
-          } else if (symptom === 'cervix') {
-            acc.cervix = cycleDay.cervix &&
-            (cycleDay.cervix.opening + cycleDay.cervix.firmness)
-          } else if (symptom === 'sex') {
-          // solo = 1 + partner = 2
-            acc.sex = cycleDay.sex &&
-            (cycleDay.sex.solo + 2 * cycleDay.sex.partner)
-          } else if (symptom === 'pain') {
-          // is any pain documented?
-            acc.pain = cycleDay.pain &&
-            Object.values(cycleDay.pain).some(x => x === true)
-          }
-          acc[`${symptom}Exclude`] = cycleDay[symptom] && cycleDay[symptom].exclude
-          return acc
-        }, {})
-
-      }
-
-      const temp = symptoms.temperature
-      if (temp) {
-        column.y = normalizeToScale(temp, this.columnHeight)
-      }
-
-      const fhmAndLtl = getFhmAndLtlInfo(dateString, temp, this.columnHeight)
-      return Object.assign(column, symptoms, fhmAndLtl)
-    })
-
-    return columns.map((col, i) => {
-      const info = getInfoForNeighborColumns(i, columns)
-      return Object.assign(col, info)
-    })
   }
 
   render() {
@@ -217,9 +175,10 @@ export default class CycleChart extends Component {
             showsHorizontalScrollIndicator={false}
             data={this.state.columns}
             renderItem={this.renderColumn}
-            keyExtractor={item => item.dateString}
+            keyExtractor={item => item}
             initialNumToRender={15}
             maxToRenderPerBatch={5}
+            windowSize={30}
             onLayout={() => this.setState({chartLoaded: true})}
           />
         }
@@ -228,7 +187,6 @@ export default class CycleChart extends Component {
   }
 }
 
-
 function getTodayAndPreviousDays(n) {
   const today = new Date()
   today.setHours(0)
@@ -240,26 +198,6 @@ function getTodayAndPreviousDays(n) {
   return range(earlierDate, today).reverse()
 }
 
-function getInfoForNeighborColumns(index, cols) {
-  const ret = {
-    rightY: null,
-    rightTemperatureExclude: null,
-    leftY: null,
-    leftTemperatureExclude: null
-  }
-  const right = index > 0 ? cols[index - 1] : undefined
-  const left = index < cols.length - 1 ? cols[index + 1] : undefined
-  if (right && right.y) {
-    ret.rightY = right.y
-    ret.rightTemperatureExclude = right.temperatureExclude
-  }
-  if (left && left.y) {
-    ret.leftY = left.y
-    ret.leftTemperatureExclude = left.temperatureExclude
-  }
-  return ret
-}
-
 const symptomIcons = {
   'bleeding': {
     'viewBox': '10 10 320 400',
diff --git a/components/chart/day-column.js b/components/chart/day-column.js
index ec3dd95..e5abc0a 100644
--- a/components/chart/day-column.js
+++ b/components/chart/day-column.js
@@ -9,15 +9,55 @@ import styles from './styles'
 import config from '../../config'
 import { getOrCreateCycleDay } from '../../db'
 import cycleModule from '../../lib/cycle'
+import { getCycleDay } from '../../db'
 import DotAndLine from './dot-and-line'
+import { normalizeToScale } from './y-axis'
 
 const label = styles.column.label
 
 export default class DayColumn extends Component {
-  constructor() {
+  constructor(props) {
     super()
+    const dateString = props.dateString
+    const columnHeight = props.columnHeight
     this.getCycleDayNumber = cycleModule().getCycleDayNumber
+    const cycleDay = getCycleDay(dateString)
+    this.data = {}
+    if (cycleDay) {
+      this.data = props.chartSymptoms.reduce((acc, symptom) => {
+        if (['bleeding', 'temperature', 'mucus', 'desire', 'note'].includes(symptom)) {
+          acc[symptom] = cycleDay[symptom] && cycleDay[symptom].value
+          if (symptom === 'temperature' && acc.temperature) {
+            acc.y = normalizeToScale(acc.temperature, columnHeight)
+            const neighbor = getInfoForNeighborColumns(dateString, columnHeight)
+            for (const key in neighbor) {
+              acc[key] = neighbor[key]
+            }
+          }
+        } else if (symptom === 'cervix') {
+          acc.cervix = cycleDay.cervix &&
+            (cycleDay.cervix.opening + cycleDay.cervix.firmness)
+        } else if (symptom === 'sex') {
+          // solo = 1 + partner = 2
+          acc.sex = cycleDay.sex &&
+            (cycleDay.sex.solo + 2 * cycleDay.sex.partner)
+        } else if (symptom === 'pain') {
+          // is any pain documented?
+          acc.pain = cycleDay.pain &&
+            Object.values(cycleDay.pain).some(x => x === true)
+        }
+        acc[`${symptom}Exclude`] = cycleDay[symptom] && cycleDay[symptom].exclude
+        return acc
+      }, this.data)
+    }
+
+    this.fhmAndLtl = props.getFhmAndLtlInfo(
+      props.dateString,
+      props.temp,
+      props.columnHeight
+    )
   }
+
   passDateToDayView(dateString) {
     const cycleDay = getOrCreateCycleDay(dateString)
     this.props.navigate('CycleDay', { cycleDay })
@@ -28,45 +68,29 @@ export default class DayColumn extends Component {
   }
 
   render() {
-    const {
-      dateString,
-      y,
-      temperatureExclude,
-      drawFhmLine,
-      drawLtlAt,
-      rightY,
-      rightTemperatureExclude,
-      leftY,
-      leftTemperatureExclude,
-      columnHeight,
-      symptomHeight,
-      chartHeight,
-      symptomRowSymptoms,
-      xAxisHeight
-    } = this.props
-
-
     const columnElements = []
+    const dateString = this.props.dateString
+    const symptomHeight = this.props.symptomHeight
 
-    if(drawLtlAt) {
+    if(this.fhmAndLtl.drawLtlAt) {
       const ltlLine = (<Line
         x1={0}
-        y1={drawLtlAt}
+        y1={this.fhmAndLtl.drawLtlAt}
         x2={config.columnWidth}
-        y2={drawLtlAt}
+        y2={this.fhmAndLtl.drawLtlAt}
         {...styles.nfpLine}
         key='ltl'
       />)
       columnElements.push(ltlLine)
     }
 
-    if (drawFhmLine) {
+    if (this.fhmAndLtl.drawFhmLine) {
       const x = styles.nfpLine.strokeWidth / 2
       const fhmLine = (<Line
         x1={x}
         y1={x}
         x2={x}
-        y2={columnHeight}
+        y2={this.props.columnHeight}
         {...styles.nfpLine}
         key='fhm'
       />)
@@ -74,15 +98,15 @@ export default class DayColumn extends Component {
     }
 
 
-    if (y) {
+    if (this.data.y) {
       columnElements.push(
         <DotAndLine
-          y={y}
-          exclude={temperatureExclude}
-          rightY={rightY}
-          rightTemperatureExclude={rightTemperatureExclude}
-          leftY={leftY}
-          leftTemperatureExclude={leftTemperatureExclude}
+          y={this.data.y}
+          exclude={this.data.temperatureExclude}
+          rightY={this.data.rightY}
+          rightTemperatureExclude={this.data.rightTemperatureExclude}
+          leftY={this.data.leftY}
+          leftTemperatureExclude={this.data.leftTemperatureExclude}
           key='dotandline'
         />
       )
@@ -108,7 +132,7 @@ export default class DayColumn extends Component {
     const column = (
       <G>
         <Rect
-          height={chartHeight}
+          height={this.props.chartHeight}
           {...styles.column.rect}
         />
         { columnElements }
@@ -118,68 +142,71 @@ export default class DayColumn extends Component {
     const symptomIconViews = {
       bleeding: (
         <SymptomIconView
-          value={this.props.bleeding}
+          value={this.data.bleeding}
           symptomHeight={symptomHeight}
           key='bleeding'
         >
           <View
             {...styles.symptomIcon}
-            backgroundColor={styles.iconShades.bleeding[this.props.bleeding]}
+            backgroundColor={styles.iconShades.bleeding[this.data.bleeding]}
           />
         </SymptomIconView>
       ),
       mucus: (
         <SymptomIconView
-          value={this.props.mucus}
+          value={this.data.mucus}
           symptomHeight={symptomHeight}
           key='mucus'
         >
           <View
             {...styles.symptomIcon}
-            backgroundColor={styles.iconShades.mucus[this.props.mucus]}
+            backgroundColor={styles.iconShades.mucus[this.data.mucus]}
           />
         </SymptomIconView>
       ),
       cervix: (
         <SymptomIconView
-          value={this.props.cervix}
+          value={this.data.cervix}
           symptomHeight={symptomHeight}
           key='cervix'
         >
           <View
             {...styles.symptomIcon}
             // cervix is sum of openess and firmness - fertile only when closed and hard (=0)
-            backgroundColor={this.props.cervix > 0 ? styles.iconShades.cervix[2] : styles.iconShades.cervix[0]}
+            backgroundColor={this.data.cervix > 0 ?
+              styles.iconShades.cervix[2] :
+              styles.iconShades.cervix[0]
+            }
           />
         </SymptomIconView>
       ),
       sex: (
         <SymptomIconView
-          value={this.props.sex}
+          value={this.data.sex}
           symptomHeight={symptomHeight}
           key='sex'
         >
           <View
             {...styles.symptomIcon}
-            backgroundColor={styles.iconShades.sex[this.props.sex - 1]}
+            backgroundColor={styles.iconShades.sex[this.data.sex - 1]}
           />
         </SymptomIconView>
       ),
       desire: (
         <SymptomIconView
-          value={this.props.desire}
+          value={this.data.desire}
           symptomHeight={symptomHeight}
           key='desire'
         >
           <View
             {...styles.symptomIcon}
-            backgroundColor={styles.iconShades.desire[this.props.desire]}
+            backgroundColor={styles.iconShades.desire[this.data.desire]}
           />
         </SymptomIconView>
       ),
       pain: (
         <SymptomIconView
-          value={this.props.pain}
+          value={this.data.pain}
           symptomHeight={symptomHeight}
           key='pain'
         >
@@ -191,7 +218,7 @@ export default class DayColumn extends Component {
       ),
       note: (
         <SymptomIconView
-          value={this.props.note}
+          value={this.data.note}
           symptomHeight={symptomHeight}
           key='note'
         >
@@ -209,14 +236,16 @@ export default class DayColumn extends Component {
         activeOpacity={1}
       >
         <View>
-          {symptomRowSymptoms.map(symptomName => symptomIconViews[symptomName])}
+          {this.props.symptomRowSymptoms.map(symptomName => {
+            return symptomIconViews[symptomName]
+          })}
         </View>
 
-        <Svg width={config.columnWidth} height={columnHeight}>
+        <Svg width={config.columnWidth} height={this.props.columnHeight}>
           {column}
         </Svg>
 
-        <View style={{height: xAxisHeight}}>
+        <View style={{height: this.props.xAxisHeight}}>
           {cycleDayLabel}
           {dateLabel}
         </View>
@@ -237,3 +266,26 @@ function SymptomIconView(props) {
   )
 }
 
+function getInfoForNeighborColumns(dateString, columnHeight) {
+  const ret = {
+    rightY: null,
+    rightTemperatureExclude: null,
+    leftY: null,
+    leftTemperatureExclude: null
+  }
+  const target = LocalDate.parse(dateString)
+  const dayBefore = target.minusDays(1).toString()
+  const dayAfter = target.plusDays(1).toString()
+  const cycleDayBefore = getCycleDay(dayBefore)
+  const cycleDayAfter = getCycleDay(dayAfter)
+  if (cycleDayAfter && cycleDayAfter.temperature) {
+    ret.rightY = normalizeToScale(cycleDayAfter.temperature.value, columnHeight)
+    ret.rightTemperatureExclude = cycleDayAfter.temperature.exclude
+  }
+  if (cycleDayBefore && cycleDayBefore.temperature) {
+    ret.leftY = normalizeToScale(cycleDayBefore.temperature.value, columnHeight)
+    ret.leftTemperatureExclude = cycleDayBefore.temperature.exclude
+  }
+
+  return ret
+}
diff --git a/components/chart/nfp-lines.js b/components/chart/nfp-lines.js
index 51842d5..cf73c52 100644
--- a/components/chart/nfp-lines.js
+++ b/components/chart/nfp-lines.js
@@ -7,7 +7,12 @@ export default function () {
   }
 
   function updateCurrentCycle(dateString) {
-    cycle.status = getCycleStatusForDay(dateString)
+    // for the NFP lines, we don't care about potentially extending the
+    // preOvu phase, so we don't include all earlier cycles, as that is
+    // an expensive db operation at the moment
+    cycle.status = getCycleStatusForDay(
+      dateString, { excludeEarlierCycles: true }
+    )
     if(!cycle.status) {
       cycle.noMoreCycles = true
       return
diff --git a/lib/sympto-adapter.js b/lib/sympto-adapter.js
index 363538e..08ec41f 100644
--- a/lib/sympto-adapter.js
+++ b/lib/sympto-adapter.js
@@ -21,7 +21,7 @@ export function getFertilityStatusStringForDay(dateString) {
   return mapToString(phaseNameForDay, dateString, status)
 }
 
-export function getCycleStatusForDay(dateString) {
+export function getCycleStatusForDay(dateString, opts = {}) {
   const {
     getCycleForDay,
     getCyclesBefore,
@@ -37,6 +37,8 @@ export function getCycleStatusForDay(dateString) {
 
   if (previousCycle) {
     cycleInfo.previousCycle = formatCycleForSympto(previousCycle)
+  }
+  if (previousCycle && !opts.excludeEarlierCycles) {
     const earlierCycles = getCyclesBefore(previousCycle[0])
     if (earlierCycles) {
       cycleInfo.earlierCycles = earlierCycles.map(formatCycleForSympto)