Just an aside.
Using this code, the other day I batch processed around 74k images into optimized (1000 on the long side) and thumbs (350 on the long side) and did watermarks on all. Most of the original images were originally around 5k on the long side. About 18GB of files were produced, probably around 85GB original files.
The programs ran fine. No time outs. I actually ran 3 instances of it from the command line at the same time.
It did take a long time but I just kicked it off and walked away. So, it saved me a bunch of effort. I have another version of it that I use for renaming files using the folder name of the set to make the file names.
Original (older content so just 768 X 1024 193kb):
Optimized (750 X 1000 75kb):
Thumb (262 X 350 14kb):
.