Okay, so check this out—I've been elbow-deep in trading platforms for years. Wow! The first time I loaded an Expert Advisor on a fresh install I felt like a kid again. My instinct said: this will be easy. Initially I thought MT5 was just MT4 with a facelift, but then realized the engine, the data handling, and the strategy tester are actually different beasts entirely.
Whoa! Seriously? Yes. MT5 feels modern. It handles multi-threaded backtests, which actually speeds up optimization in a real way. On one hand it seems like a small upgrade. Though actually, it's a platform that requires different...