Significant performance regression of signal-slot in heavily multithreaded context

[Alex2772]

What happened?

This is due to introduction of AObjectBase::SIGNAL_SLOT_GLOBAL_SYNC. If I comment out these locks, the regression dissapears.

Relevant log output or stack trace

Steps to reproduce

Spam AThreadPool with tasks which create AObjects, make connections and emit signals.

Affected Platforms

No response

Link to build, i.e. failing GitHub Action job (if any).

No response