This has been my experience as well, not to mention how much the client slowed down my machine. It&#x27;s been really slow going but the client is getting better. 
I never tried doing the encryption on my side, though, they also do diffs on each file you upload so I imagine that has something to do with the lag.
I still use spideroak, they&#x27;re the only company I&#x27;m aware of that encrypts locally and also has done a lot to progress personal security for all of us.
So I&#x27;ve gotten used to the slow speeds and buggy software, it keeps getting better so that&#x27;s a big plus :)