diff --git a/README.md b/README.md
index 66dd496..d151b65 100644
--- a/README.md
+++ b/README.md
@@ -217,6 +217,8 @@ tap_action:
   fold_row: true
 ```
 
+- You can disable the smooth open and close animation with `no_animation: true`
+
 ## More examples
 
 All my test cases are available in the `test/views` directory.
diff --git a/fold-entity-row.js b/fold-entity-row.js
index c40403b..3a7b2cd 100644
--- a/fold-entity-row.js
+++ b/fold-entity-row.js
@@ -1,4 +1,4 @@
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e.initializer&&(this[e.key]=e.initializer.call(this))},finisher(i){i.createProperty(e.key,t)}};function G(t){return(e,i)=>void 0!==i?((t,e,i)=>{e.constructor.createProperty(i,t)})(t,e,i):Z(t,e)}var Q="20.0.14";async function X(t,e,i=!1){let s=t;"string"==typeof e&&(e=e.split(/(\$| )/)),""===e[e.length-1]&&e.pop();for(const[t,o]of e.entries())if(o.trim().length){if(!s)return null;s.localName&&s.localName.includes("-")&&await customElements.whenDefined(s.localName),s.updateComplete&&await s.updateComplete,s="$"===o?i&&t==e.length-1?[s.shadowRoot]:s.shadowRoot:i&&t==e.length-1?s.querySelectorAll(o):s.querySelector(o)}return s}const tt={open:!1,padding:24,group_config:{},tap_unfold:void 0};function et(t){if(void 0!==t)return"string"==typeof t?{entity:t}:t}async function it(t,e=0){return 100!=e&&(!!t&&("hui-entities-card"===t.localName||"hui-picture-elements-card"===t.localName?t:(t.updateComplete&&await t.updateComplete,t.parentElement?it(t.parentElement,e+1):t.parentNode?it(t.parentNode,e+1):!!t.host&&it(t.host,e+1))))}const st=(t,e)=>{const i=document.body.querySelector("action-handler");i&&i.bind(t,e)},ot=(t=>(...e)=>({_$litDirective$:t,values:e}))(class extends class{constructor(t){}get _$AU(){return this._$AM._$AU}_$AT(t,e,i){this._$Ct=t,this._$AM=e,this._$Ci=i}_$AS(t,e){return this.update(t,e)}update(t,e){return this.render(...e)}}{update(t,[e]){return st(t.element,e),U}render(t){}});class nt extends J{constructor(){super(...arguments),this.height=0,this.maxheight=0,this.entitiesWarning=!1,this.slowclick=!1}setConfig(t){var e,i,s,o;this._config=t=Object.assign({},tt,t),this.open=null!==(i=null!==(e=this.open)&&void 0!==e?e:this._config.open)&&void 0!==i&&i,this.renderRows=this.open;let n=et(t.entity||t.head);if(!n)throw new Error("No fold head specified");void 0===this._config.clickable&&void 0===n.entity&&void 0===n.tap_action&&(this._config.clickable=!0),this._config.slowclick&&(this.slowclick=!0);let r=t.entities||t.items;if(n.entity&&void 0===r&&(r=null===(o=null===(s=(document.querySelector("hc-main")?document.querySelector("hc-main").hass:document.querySelector("home-assistant")?document.querySelector("home-assistant").hass:void 0).states[n.entity])||void 0===s?void 0:s.attributes)||void 0===o?void 0:o.entity_id),void 0===r)throw new Error("No entities specified.");if(!r||!Array.isArray(r))throw new Error("Entities must be a list.");(async()=>{this.head=await this._createRow(n,!0),this._config.clickable&&(st(this.head,{}),this.head.addEventListener("action",(t=>this._handleClick(t)),{capture:!0}),this.head.tabIndex=0,this.head.setAttribute("role","switch"),this.head.ariaLabel=this.open?"Toggle fold closed":"Toggle fold open"),this.rows=await Promise.all(r.map((async t=>this._createRow(et(t)))))})()}async _createRow(t,e=!1){var i,s,o,n;const r=await window.loadCardHelpers(),l=await it(this),a=null!==(o=null!==(i=this._config.state_color)&&void 0!==i?i:null===(s=null==l?void 0:l._config)||void 0===s?void 0:s.state_color)&&void 0!==o?o:null===(n=null==l?void 0:l.config)||void 0===n?void 0:n.state_color;t=Object.assign(Object.assign({state_color:a},e?{}:this._config.group_config),t);const h=r.createRowElement(t);return this.applyStyle(h,t,e),this._hass&&(h.hass=this._hass),h}async applyStyle(t,e,i=!1){if(i)if("hui-section-row"===t.localName){this.classList.add("section-head"),t.style.minHeight="53px";const e=await async function(t,e,i=!1,s=1e4){return Promise.race([X(t,e,i),new Promise(((t,e)=>setTimeout((()=>e(new Error("timeout"))),s)))]).catch((t=>{if(!t.message||"timeout"!==t.message)throw t;return null}))}(t,"$.divider");e&&(e.style.marginRight="-40px")}else this.classList.remove("section-head");await customElements.whenDefined("card-mod"),customElements.get("card-mod").applyToElement(t,"row",e.card_mod?e.card_mod.style:e.style,{config:e})}toggle(t){var e;null===(e=this.shadowRoot.querySelector("#items"))||void 0===e||e.classList.add("clip"),this.open?(this.open=!1,setTimeout((()=>{this.renderRows=!1}),this._config.no_animation?1:250)):(this.open=!0,this.renderRows=!0,setTimeout((()=>{var t;null===(t=this.shadowRoot.querySelector("#items"))||void 0===t||t.classList.remove("clip")}),this._config.no_animation?1:250)),this._config.clickable&&(this.head.ariaLabel=this.open?"Toggle fold closed":"Toggle fold open",this.head.ariaChecked=this.open?"true":"false")}set hass(t){var e;this._hass=t,null===(e=this.rows)||void 0===e||e.forEach((e=>e.hass=t)),this.head&&(this.head.hass=t)}async updateHeight(){this.height=this.open?this.maxheight:0}async updated(t){super.updated(t),(t.has("open")||t.has("maxheight"))&&(this.updateHeight(),this._cardMod&&this._cardMod.forEach((t=>t.refresh())))}firstUpdated(){this._config.open&&window.setTimeout((()=>{this.updateHeight()}),100);const t=this.shadowRoot.querySelector("#measure");try{this.observer=new ResizeObserver((()=>{var e;null===(e=this.shadowRoot.querySelector("#items"))||void 0===e||e.classList.add("transit"),this.maxheight=t.scrollHeight,this.updateHeight(),this.updateComplete.then((()=>{var t;return null===(t=this.shadowRoot.querySelector("#items"))||void 0===t?void 0:t.classList.remove("transit")}))})),this.observer.observe(t)}catch(t){this.maxheight=1e6}}connectedCallback(){super.connectedCallback(),window.setTimeout((()=>{this.isConnected&&!this.entitiesWarning&&it(this).then((t=>{t||!0===this._config.mute||(this.entitiesWarning=!0,console.group("%cYou are doing it wrong!","color: red; font-weight: bold"),console.info("Fold-entity-row should only EVER be used INSIDE an ENTITIES CARD."),console.info("See https://github.com/thomasloven/lovelace-fold-entity-row/issues/146"),console.info(this),console.groupEnd())}))}),1e3)}_customEvent(t){t.detail.fold_row&&this.toggle(t)}async _handleClick(t){const e=this._handleClick;if(e.coolDown)return void t.stopPropagation();if("tap"!==t.detail.action)return e.coolDown=setTimeout((()=>e.coolDown=void 0),300),void("double_tap"===t.detail.action&&(e.doubleTapped=!0));const i=t.composedPath();t.stopPropagation(),e.doubleTapped=!1,this.slowclick&&await new Promise((t=>setTimeout(t,250))),e.doubleTapped||i[0]==this.head&&this.toggle(t)}render(){var t;return P`
       <div id="head" @ll-custom=${this._customEvent} ?open=${this.open}>
         ${this.head}
         <ha-icon
@@ -18,9 +18,10 @@ function t(t,e,i,s){var o,n=arguments.length,r=n<3?e:null===s?s=Object.getOwnPro
         aria-hidden="${String(!this.open)}"
         aria-expanded="${String(this.open)}"
         style=${`padding-left: ${this._config.padding}px; max-height: ${this.height}px;`}
+        class=${this._config.no_animation?"notransition":""}
       >
         <div id="measure">
-          ${this.renderRows?null===(t=this.rows)||void 0===t?void 0:t.map((t=>R`<div>${t}</div>`)):""}
+          ${this.renderRows?null===(t=this.rows)||void 0===t?void 0:t.map((t=>P`<div>${t}</div>`)):""}
         </div>
       </div>
     `}static get styles(){return n`
@@ -69,6 +70,12 @@ function t(t,e,i,s){var o,n=arguments.length,r=n<3?e:null===s?s=Object.getOwnPro
       #items.clip {
         overflow: clip;
       }
+      #items.notransition {
+        transition: none;
+      }
+      #items.transit {
+        transition: none;
+      }
 
       #measure {
         overflow-x: clip;
diff --git a/package.json b/package.json
index 6cce069..d455e29 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "fold-entity-row",
   "private": true,
-  "version": "20.0.13",
+  "version": "20.0.14",
   "description": "",
   "scripts": {
     "build": "rollup -c",
diff --git a/src/main.ts b/src/main.ts
index b246994..70557ae 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -22,6 +22,7 @@ interface FoldEntityRowConfig {
   mute?: boolean;
   state_color?: boolean;
   slowclick?: boolean;
+  no_animation?: boolean;
 }
 
 const DEFAULT_CONFIG = {
@@ -186,15 +187,21 @@ class FoldEntityRow extends LitElement {
     this.shadowRoot.querySelector("#items")?.classList.add("clip");
     if (this.open) {
       this.open = false;
-      setTimeout(() => {
-        this.renderRows = false;
-      }, 250);
+      setTimeout(
+        () => {
+          this.renderRows = false;
+        },
+        this._config.no_animation ? 1 : 250
+      );
     } else {
       this.open = true;
       this.renderRows = true;
-      setTimeout(() => {
-        this.shadowRoot.querySelector("#items")?.classList.remove("clip");
-      }, 250);
+      setTimeout(
+        () => {
+          this.shadowRoot.querySelector("#items")?.classList.remove("clip");
+        },
+        this._config.no_animation ? 1 : 250
+      );
     }
     if (this._config.clickable) {
       this.head.ariaLabel = this.open
@@ -233,10 +240,19 @@ class FoldEntityRow extends LitElement {
     const el = this.shadowRoot.querySelector("#measure") as HTMLElement;
     try {
       this.observer = new ResizeObserver(() => {
+        // If a change happens to the height of an internal element
+        // turn off animation, update height, redraw,
+        // and then turn animations back on.
+        this.shadowRoot.querySelector("#items")?.classList.add("transit");
         this.maxheight = el.scrollHeight;
+        this.updateHeight();
+        this.updateComplete.then(() =>
+          this.shadowRoot.querySelector("#items")?.classList.remove("transit")
+        );
       });
       this.observer.observe(el);
     } catch (_e) {
+      // Old safari versions don't have ResizeObserver
       this.maxheight = 1e6;
     }
   }
@@ -330,6 +346,7 @@ class FoldEntityRow extends LitElement {
         aria-hidden="${String(!this.open)}"
         aria-expanded="${String(this.open)}"
         style=${`padding-left: ${this._config.padding}px; max-height: ${this.height}px;`}
+        class=${this._config.no_animation ? "notransition" : ""}
       >
         <div id="measure">
           ${this.renderRows
@@ -387,6 +404,12 @@ class FoldEntityRow extends LitElement {
       #items.clip {
         overflow: clip;
       }
+      #items.notransition {
+        transition: none;
+      }
+      #items.transit {
+        transition: none;
+      }
 
       #measure {
         overflow-x: clip;
diff --git a/test/views/2_cooperation.yaml b/test/views/2_cooperation.yaml
index 27c1554..4ec1080 100644
--- a/test/views/2_cooperation.yaml
+++ b/test/views/2_cooperation.yaml
@@ -304,6 +304,23 @@ cards:
               - light.bed_light
               - light.bed_light
               - light.bed_light
+          - type: custom:fold-entity-row
+            no_animation: true
+            head:
+              entity: light.bed_light
+              name: no_animation
+            entities:
+              - light.bed_light
+              - light.bed_light
+              - light.bed_light
+              - light.bed_light
+              - light.bed_light
+              - light.bed_light
+              - light.bed_light
+              - light.bed_light
+              - light.bed_light
+              - light.bed_light
+              - light.bed_light
   - type: vertical-stack
     cards:
       - <<: *desc