diff --git a/src/components/charts/Column.jsx b/src/components/charts/Column.jsx
index 4be6328..0a7eea5 100644
--- a/src/components/charts/Column.jsx
+++ b/src/components/charts/Column.jsx
@@ -1,4 +1,4 @@
-import { useState, useEffect } from 'react'
+import React, { useState, useEffect } from 'react'
 import { ChartTimeBase } from './ChartTimeBase'
 
 const chartPluginsOptions = {
@@ -45,8 +45,10 @@ export const GetOrCreateDatasetByLineConfig = (data, lineConfig) => {
   return dataset
 }
 
-export const Column = ({ lineGroup, data, postParsing, interval, yDisplay, yStart, pointCount, savePreviousData }) => {
+export const Column = React.memo(({ lineGroup, data, postParsing, interval, yDisplay, yStart, pointCount, savePreviousData }) => {
   const [dataParams, setDataParams] = useState({data: {datasets:[]}, yStart, })
+  if (!pointCount || !Number.isInteger(pointCount))
+    pointCount = 2048
 
   useEffect(()=>{
     if((lineGroup.length === 0) || (data.length === 0)) return
@@ -83,9 +85,4 @@ export const Column = ({ lineGroup, data, postParsing, interval, yDisplay, yStar
   }, [data, lineGroup, interval, yDisplay, yStart, postParsing, pointCount, savePreviousData])
 
   return <ChartTimeBase dataParams = { dataParams } options = { chartPluginsOptions } />
-}
-
-Column.defaultProps = {
-  pointCount: 2048,
-  savePreviousData: false
-}
+})
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