The Switch hardware can technically run Salt and Sanctuary at 60 FPS in 2D mode, but the official patch caps it at 30 to prevent thermal throttling.
For advanced users, the search for "salt and sanctuary switch rom nsp update better" leads to community-patched versions that go beyond official fixes. Because the Switch is a closed system, some modders have unlocked features Nintendo never certified.
The Crypt of Dead Gods was infamous for memory leak crashes on the Switch. The updated NSP patches the memory allocation, making it possible to spend hours in this hub area without a single crash.
If you are still playing the base 1.0.0 version of Salt and Sanctuary, you are enduring an inferior product. The "better" part of your search query refers to the cumulative patches that Ska Studios released. Here is exactly what improves when you install the latest update: