Dear all,
Cryptomator was running perfectly fine until a few days ago (maybe due an update, I don’t remember). Since then, it takes me minimum 20 seconds to open any 15ko office file. I tried many manipulation (switch to WinFsp, try to keep local copy of files…) but nothing solved my problem. It seems that it’s due to a sync issue between office and cryptomator. Does anyone could help?
infeo
December 18, 2025, 2:32pm
2
Welcome to the Cryptomator Community
recently we recieved another user report about this lagging behaviour on our issue tracker: Microsoft 365: Severe performance issues · Issue #4077 · cryptomator/cryptomator · GitHub
Unfortunately, the reason is currently not known.
infeo
January 9, 2026, 3:01pm
3
@lepinceau1 Do you still experience the problems?
If so, please post the output of the following terminal command (it requires an administrative terminal):
fltmc filters
It might be an issue of an intrusive AV product.
Nom de filtre Nom. d’instn. Altitude Cadre
bindflt 1 409800 0
dtdsel 9 389242.142 0
MsSecFlt 15 385600 0
UCPD 13 385250.5 0
WdFilter 13 328010 0
storqosflt 0 244000 0
wcifs 0 189900 0
WIMMount 8 180700 0
CldFlt 6 180451 0
bfs 15 150000 0
FileCrypt 0 141100 0
luafv 1 135000 0
UnionFS 0 130850 0
npsvctrig 1 46000 0
Wof 8 40700 0
FileInfo 13 40500 0
Hi, here are the filters I have.
Thanks for having a look at it
infeo
January 19, 2026, 11:51am
6
@lepinceau1 We posted our analysis in the linked issue ticket. There you also find suggestions you can try out.
Hi, I simply added cryptomator as defender exceptions and set crypto to “webdav” –> problem solved!
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