Locals and Expressions view is very slow when debugging with CDB

When debugging with Windows Kit 10 CDB debugger, the Locals and Expressions view is loading extremely slowly if there is any out of scope variables added to the express evaluator list.

There are several messages about "Either you specified an unqualified symbol, or your debugger doesn't have full symbol information..." (see attachment) for each of the watched variables. With Windows Kit 8.1 CDB debugger there is only one of the previous entries for each watched variable, but it is still extremely slow.

It seems that some of the variables that have been watched in earlier debugging sessions, are still kept in the watch list except that they are invisible in Qt Creator. Removing that watch list manually from Qt Creator saved settings speeds up the debugger greatly, until it starts getting slow again when the entries accumulate.