Playing on TurboWarp might help the lag. Use the mouse to move. The next Poptropica project release will hopefully be a recreation of the poptropica home island.
This is @griffpatch's engine. The control system is based of the controls in Poptropica, as I want to make a Poptropica type game in the future. It is very laggy though. The movement is fast and gravity is low because that's how it is in Poptropica. I'll perfect it later. Hey, this can also be used as a mobile platforming engine if you change some stuff. If you do that, please give credit.