From 0f574a765bae7de8ed45fa478ea91cae71928c9c Mon Sep 17 00:00:00 2001
From: larena1 <60823161+larena1@users.noreply.github.com>
Date: Wed, 24 Feb 2021 17:48:50 +0100
Subject: [PATCH] Fix excessive rerendering of history charts (#8340)

Co-authored-by: Bram Kragten <mail@bramkragten.nl>
---
 src/components/state-history-charts.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/components/state-history-charts.ts b/src/components/state-history-charts.ts
index a8faeb80d9..49ac8049c5 100644
--- a/src/components/state-history-charts.ts
+++ b/src/components/state-history-charts.ts
@@ -6,6 +6,7 @@ import {
   html,
   LitElement,
   property,
+  PropertyValues,
   TemplateResult,
 } from "lit-element";
 import "./state-history-chart-line";
@@ -83,6 +84,10 @@ class StateHistoryCharts extends LitElement {
     `;
   }
 
+  protected shouldUpdate(changedProps: PropertyValues): boolean {
+    return !(changedProps.size === 1 && changedProps.has("hass"));
+  }
+
   private _isHistoryEmpty(): boolean {
     const historyDataEmpty =
       !this.historyData ||