Asmodeus Can you upload a capx or screenshot or otherwise describe what you want to do? Odds are it can be restructured to avoid this bug.
Also, unless you're performing heavy logic inside your loop of creation, you'll probably find that GPU is where your game will bottleneck, rather than CPU usage.
Construct Classic is based on C++, and the events perform much faster than the (optional) Python implementation (to give you an idea of the speed of cycles).
Edit: Also, a whole sheet of events (or sheets if others are imported), will be run through to constitute one "tick" in the game.