Seems like all of your problems are coming from GC. If you're computer cannot handle a lot of checks, or refreshing, and you don't want to go into low cpu mode, you need to increase the amount of memory for the application. OR, if your client hasn't been restarted in a while and you keep starting and stopping scripts, you can run into and over load error. Super simple fix though! It will remove all lag and you won't get GC over loads anymore. Either close and restart your client regularly, or to give it more memory so the error won't happen again, open up the OSBot client using terminal or Command prompt. It requires you to have Java JDK 8+ to do so. It's free and can be found on Oracle's website for java downloads! Use this code to do so:
EDIT: I am looking into the situation right now to see if I can reduce the GC error. Just increase memory right now to get around it and you'll be fine.