Blocs lagging v3.3(latest)

When typing new classes at right panel, blocs start really lagging like in times pf windows 98, when any window becoming white and start cloning any background while moving this window (swatches)

Try restarting Blocs, and then your Mac (if the first doesn’t help). If it continues and is consistent let me know.

Every time this happens i am restarting blocs.
I`m using mac os x el capitan 10.11.6

Maybe blocs creating some logs?