Very sluggish in sentence mode

When in sentence mode (in my case Japanese) after some minutes the tab grinds to a halt pretty much. Only solution is to refresh or open a new tab. This happened in Chrome.

Sorry to hear that. How often that happens?

Almost always.

I am also experiencing slowness when in sentence mode for Japanese. Eventually I have to refresh the tab as it becomes unusable. I am using MS Edge.

Thanks, we will investigate the problem.