Extremely high cpu usage on Python 3.10 causing lag and slowness

[aoslamda]

Created a minimal working example of Tkintermapview on Python 3.10 and cpu usage skyrockets to 310%. I compared this to the same working example on Python 3.8 and cpu usage is fine at 60%.

[Jarauvi]

I reduced image_load_thread_pool size from initial value 25 to 4. CPU load was halved and tiles were loaded in about 4 seconds while by default loading time was almost 13 seconds.

Here are the logged processing times of individual threads from the moment image_load_queue_tasks is populated to the moment the queue is empty again:

25 threads: done in 9.337615 done in 9.554295 done in 10.7789 done in 11.088345 done in 11.147088 done in 11.160177 done in 11.424975 done in 11.437656 done in 11.494931 done in 11.634528 done in 11.684579 done in 11.650118 done in 11.743283 done in 11.831032 done in 11.905858 done in 12.078805 done in 12.490917 done in 12.666273 done in 12.724669 done in 12.775328 done in 12.816464 done in 12.858942 done in 12.817465 done in 12.882834

4 threads: done in 3.73019 done in 3.759539 done in 3.858024 done in 3.881888

[FedoB]

Is the above solution valid?