Press A and D to move the cat left and right respectively. This is an attempt at a quick n' dirty implementation of Delta Time. What is Delta Time? Here's an abridged explanation: Delta Time (AKA DT) is a number that speed sensitive variables in software are multiplied by to make the effective speed effecting said variables virtually the same between different computer processors which themselves process things at different speeds. Scratch runs the same on modern computers for the most part, but there's an issue with how Scratch projects are run on Mozilla Firefox. The Javascript interpreter Firefox uses (Spidermonkey) is substantially slower than what the base of many other browsers uses: Chromium. (V8) Using DT, this discrepancy can be mitigated. The FPS is perpetually slow, but the logic should run at the same effective speed it would in ideal circumstances. I should also mention I can't tell if this works or not :P