If it is only one ifg, it might not influence the StaMPS process so much.
However, concerning your processing problem:
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Check if you can increase the RAM that can be used by SNAP
Increase snappy memory (beginner)snap2stamps uses the gpt API of SNAP, check out the snap2stamps Manual 1.1 Installation in order to set up the memory for gpt -
If possible, write the outputs to a SSD, for me that really made a significant difference in processing