Xcode 11 debugger is extremely slow - A known problem?

Question

Since I updated to the latest Xcode version 11.0 (11A420a) the debugging is extremely slow and cumbersome.

EDIT: After updating to 11.1 GM (11A1027

Answer 1

I had 238 unused breakpoints set. When I deleted them, it's fast again (even with diagnostics turned on.)