Check this post:
After Briefly looking into it (we are still looking) we found that the memory reserved for some processes was increased (double) than in previous build. it's not a real issue as the memory is just reserved not allocated, and can be freed if needed. it does however change the amount of memory presented as "Free".
This will explain part of the "lost memory" you see.
Stated in: https://community.checkpoint.com/t5/SMB-Gateways-Spark/Memory-increase-in-FW-s-model-SMB-1800-after-...
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