I made this b/c a single typeracer tab on chrome was using over 500 MB of RAM and I also noticed latency.
I tested BrightType on an old laptop w/ 2 GB RAM, an HDD, & a slow CPU, and the typing experience is still smooth. If only I was born 30 years earlier... BrightType would have been so popular.
Version 1.1 (94 KB exe size) new features: