Batch processing speed very slowly after version 2.4.2

After updated to version 2.4.2, I found the processing speed for batch images more than 150 to 200 pics would become more and more slowly, that means, if I make the same setting to all pics, the first 150 to 200 pics will take about 10 to 20 sec for each image, but after it will take more and more time, the program looks like stall ( other program still runs normally) and it will take up to 3 to 4 minutes to process each image. I didn’t have this problem on previous versions even I put 1000 image for a batch, it keeped the same processing speed form the first imge to the last one.

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