If somebody has some time for FUSE benchmarking:

diff --git a/src/borg/fuse.py b/src/borg/fuse.py
index 429790e4..27ab1c1a 100644
--- a/src/borg/fuse.py
+++ b/src/borg/fuse.py
@@ -644,12 +644,13 @@ def read(self, fh, offset, size):
                 data = self.data_cache[id]
                 if offset + n == len(data):
                     # evict fully read chunk from cache
-     

Right dduper has minimal test script to check basic functionality See ci/gitlab/*.sh . Enhance it add RAID tests.