Renders on every hass update

[htmltiger]

Hi,

I have added a large table but after adding it the browser was so slow and found the cause to be flex table.
just added this

   set hass(hass) {
        const config = this._config;
        const root = this.shadowRoot;
	console.log('set hass');

and in the chrome developer tools it is refreshing so many times in a second and it is redrawing the whole table.

I think shouldUpdate(changedProps) {... } function should help

Thanks.

[ildar170975]

Seems that I see the same issue.
If I open Code Inspector for a flex-table card, I observe a permanent updating of the card:

See that flickering on the DOM tree.

[daringer]

closed by #103