TRichView.com

It have to be enough, it is a "specialized" critical section which allows multi-threaded read access to memory but write is exclusive to the calling thread, to say so. Even VCL help lists critical section or this synchronizer as an alternative to using Synchronize method.

I tried to use Synchronize ...

It is protected by TMultiReadExclusiveWriteSynchronizer, that code is in write exclusive section.

I have a problem with repainting of changed pictures in our version (1.9.42) of TRichView.

Here is the situation.
There are several threads that download web images and then update items in RVData (items receive temporary images until then).
When image is downloaded and saved to disk I use exactly ...