I believe there was a performance update in one of the Betas that allow the processing to run in parallel of Browser, significantly improving the overall performance of games. Do we know when this will be in the Stable version?
Currently, my game runs slow on iPad:
https://itunes.apple.com/us/app/ruffs-delivery/id1434036286?ls=1&mt=8
Android version:
https://play.google.com/store/apps/details?id=com.lumicreative.ruffsdelivery
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I don't think anyone can help you with that other than construct staff so this is probably in the wrong place.
Thanks — I found a related issue here: https://www.construct.net/forum/construct-3/general-discussion-7/construct3-performance-after-p-137349