Please note that the performance may depend on a variety of factors. Such as the amount of opened tabs in your browser or browsers on your computer, extensions (i.e. Adblock), which adds to the browser, how long a browser has worked without restarting, etc.
To try and fix freezing (slowness), try these solutions below:
reload your chart page;
restart your browser;
close additional tabs (except for your chart);
remove added extensions in your browser;
use another browser.