A setting will be added back into Release soon to limit the number of stash tabs the bot will use. It will still have to request all of those though, but you'll be able to lower the limit. The actual logic won't be rewritten to use the new API like was planned, due to the new beta being worked on instead. When we updated to .Net 4.5.1, we also got a new coroutine library, which requires updating all the coroutines to a new format. As a result, I decided not to rewrite the old style coroutines for the fix, since I'll just have to rewrite it again pretty soon.
There should be a patch this week, so that will be worked in then. In the next patch, Beta will not be updated due to the rewrite and coroutine changes, but Release will be updated and maintained until the new Beta is ready for testing. The only change will be that Release won't get new features or major changes, since they are all going to be done in Beta.
