Lately when playing by myself, I have noticed that my FPS starts to slow to a crawl after around the 30 minute mark. This has happened in multiple games with multiple heroes present.

To see if it was just my PC, I tried playing with the default bots, and no such slowdown ever occurred.

There may be too many commands being issued at once or a possible memory leak situation. In any case, I hope you will get this taken care of ASAP because this bot AI is really fun.