Have you read https://www.scirra.com/manual/134/performance-tips?
The most common limitations have to do with graphics memory, object count, and rendering/fill rate. These can be pretty much eliminated with good design. Otherwise, fine control over memory management is something that you might miss.
I've seen projects with well over 1000 events... That is generally not a big deal. As I mentioned before, it is all about your design. For example, I can use a single event with loops and a ton of collision checks to slow rendering to a crawl.
If you dig into the blogs, I recall seeing some example benchmarks for browser performance at some point, those may be of interest to you.
I think you don't have to worry about compiling, ever. The program generally does a great job keeping you from making stupid syntax mistakes, as far as I've experienced.
Honestly though, just try it! The free version has more than enough capability for you to try to push the limits of whatever you are trying to do.