How to disable map rendering while downloading

[DmitryKz]

Is there a way to disable map rendering while tiles are loading? I have not found such an option in the settings.
It seems to me that as the tiles are downloaded, the rendering time increases and, accordingly, the downloading process slows down.
For example, I am currently loading about 300 tiles. And by the date of creation of the image files, you can see how the process is slowing down. If 10 tiles were downloaded in the first minute, then only 4 tiles are downloaded on the 200th tile every minute and only 3 tiles per minute at the very end of the process, i.e. on the 300th tile.
I guess this is precisely because of the constant rendering of the map after each tile is downloaded.
Hence the question - is there a way to disable map rendering while tiles are downloading?

[geophil]

Downloading and rendering are handled by two separate and largely independent threads. However, the more data is loaded, the more memory is needed. The underlying Win32 image processing uses implicit compression. Otherwise it would be impossible to keep hundreds of tiles in memory simultaneously. It's hard to tell whether image compressing/decompressing, memory allocation or actual rendering slows things down.

I suggest to do smaller sets and then merge the different groups.