If the browser crashes, it's a bug in the browser, not Construct 2. If it freezes and the script times out, it may be a mistake in your own events, e.g. very long lasting loops. There are no steps to reproduce provided and the example is too complicated to deduce if the problem is really with Construct 2, so closing this report. Please file a new report following all the guidelines including providing a minimal .capx that conclusively shows the issue is a problem with C2 and not your own events.