Do you let the process run from the command line or directly within SNAP Desktop?
In Desktop you can try to increase the cache.
Go to Tools\Options and switch to the Performance tab. Set the Cache size to a higher value. e.g. 4096.
You can also try to use the file cache. Therefor you need to change the option on the S1TBX tab.
If you use gpt on the command line you can specify the -c parameter. Probably you also need to set the -q option. Maybe to something like 120. See
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