It is good but screen rendering is sluggish

I have been using this plugin for more than 6 months. It is good but it is extremely sluggish when rendering questions on the screen, it sometimes hang and get error. Also, I tried my best to customize certificate but could not do it. Except these problems, it is good and serves my purpose.

I hope these issues are addressed 1) rendering issue and 2) few certificate templates to pick from

Also, I expect plugin to add video recording while giving a test/quiz so that it can be used for conducting competitive exams which students can attend remotely.