Some performance optimizations

package.json

@@ -59,6 +59,7 @@
     "@ctrl/tinycolor": "^2.6.1",
     "@material/mwc-ripple": "^0.15.0",
     "custom-card-helpers": "^1.6.5",
+    "fast-copy": "^2.1.0",
     "home-assistant-js-websocket": "^5.1.0",
     "lit-element": "^2.3.0",
     "lit-html": "^1.2.0"

src/button-card.ts

@@ -55,7 +55,9 @@ import {
 } from './helpers';
 import { styles } from './styles';
 import { myComputeStateDisplay } from './compute_state_display';
+import copy from 'fast-copy';
 import * as pjson from '../package.json';
+import { deepEqual } from './deep-equal';
 
 let helpers = (window as any).cardHelpers;
 const helperPromise = new Promise(async resolve => {
@@ -308,7 +310,7 @@ class ButtonCard extends LitElement {
   }
 
   private _objectEvalTemplate(state: HassEntity | undefined, obj: any | undefined): any {
-    const objClone = JSON.parse(JSON.stringify(obj));
+    const objClone = copy(obj);
     return this._getTemplateOrValue(state, objClone);
   }
 
@@ -616,11 +618,10 @@ class ButtonCard extends LitElement {
           'grid-area': key,
         };
         let thing;
-        const stringConfig = JSON.stringify(cards[key]);
-        if (this._cardsConfig[key] !== stringConfig) {
+        if (!deepEqual(this._cardsConfig[key], cards[key])) {
           thing = this._createCard(cards[key]);
           this._cards[key] = thing;
-          this._cardsConfig[key] = stringConfig;
+          this._cardsConfig[key] = copy(cards[key]);
         } else {
           thing = this._cards[key];
         }
@@ -1021,7 +1022,7 @@ class ButtonCard extends LitElement {
     if (this._config.entity && !this._entities.includes(this._config.entity)) this._entities.push(this._config.entity);
     this._expandTriggerGroups();
 
-    const rxp = new RegExp('\\[\\[\\[.*\\]\\]\\]', 'gm');
+    const rxp = new RegExp('\\[\\[\\[.*\\]\\]\\]', 'm');
     this._hasTemplate = this._config.triggers_update === 'all' && jsonConfig.match(rxp) ? true : false;
     if (!this._initial_setup_complete) {
       this._initConnected();

yarn.lock

@@ -2202,6 +2202,11 @@ extsprintf@^1.2.0:
   resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.4.0.tgz#e2689f8f356fad62cca65a3a91c5df5f9551692f"
   integrity sha1-4mifjzVvrWLMplo6kcXfX5VRaS8=
 
+fast-copy@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/fast-copy/-/fast-copy-2.1.0.tgz#99c1b842aee063f8212d6f749080c196a822b293"
+  integrity sha512-j4VxAVJsu9NHveYrIj0+nJxXe2lOlibKTlyy0jH8DBwcuV6QyXTy0zTqZhmMKo7EYvuaUk/BFj/o6NU6grE5ag==
+
 fast-deep-equal@^3.1.1:
   version "3.1.3"
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz#3a7d56b559d6cbc3eb512325244e619a65c6c525"