File checking speed for 4.4.0 is much slower than 4.3.9

[Coresi7]

qBittorrent & operating system versions

qBittorrent: 4.3.9 x64
Operating system: Windows server 2022 datacenter 21h1 (10.0.20348)
libtorrent-rasterbar: 1.2.14
qt: 5.15.2

What is the problem?

qbittorrent v4.4.0 with qt6 file check speed is extremely slow, compare to qbittorrent v4.3.9. About 2x slower for hdd, or 10x slower for samba protocol.
require for a fix, thanks!

Steps to reproduce

No response

Additional context

No response

Log(s) & preferences file(s)

No response

[NoCodeJustPancakes]

Same issue here, I made no changes other than upgrading program version. 4.3.9 checks files at 400MB/s+ I switch to 4.4.0 check same file, speeds drop to 100MB/s. Reinstall 4.3.9, check file, back to 400MB/s+,

[Cjaker]

Slow check on 4.4.0 and hangs/freeze hardly (feeling of 1~5 FPS on UI)
Downgraded to 4.3.9 and everything is fine

Windows 10 x64 21H2 Build - 19044.1466

[UnviableFriend]

I'm not sure if this is the cause, but I was just doing a force recheck on a 38GB torrent, and I have 32GB of RAM. I noticed my client became very sluggish and looked over to my task manager to see my memory usage was at 100%. Stopping the recheck completely(just a pause didn't work) and my memory was freed. When I tried again I could see my memory usage climbing as the recheck progressed. Restarting qBittorrent didn't fix the issue and memory usage again kept climbing trying to recheck the torrent.
Windows 10
qBittorrent: 4.4.0
Qt: 5.15.2
Libtorrent: 2.0.5.0
Boost: 1.78.0
OpenSSL: 1.1.1m
zlib: 1.2.11

[captincorpse]

Same issue here. All I did was update to 4.4.0 and the file recheck is extremely slow now. There may be a memory leak, several times my ram maxed out and qBittorent was using it all. Win 10 with 16Gb ram, qBittorrent was using using 9Gb at one time during file recheck. This started when I noticed a torrent wasn't updating file progress during download. It downloaded over 100Gb of a 150Gb file and showed about 9% done, initiated file recheck and it has been running for 2 hours trying to recheck.

[thalieht]

Is qBittorrent v4.4.0 with Libtorrent 1.2.15 still slower than qBitorrent v4.3.9?

Which can be found here on the bottom https://github.com/qbittorrent/qBittorrent/actions/runs/1665307409
It will probably be back to normal with this version because rechecking is a libtorrent operation.

[Desef]

The GUI keeps freezing for 2 to 3 seconds with 4.4.0. Reverting to 4.3.9 has zero freezing. Re-loading 4.4.0 again causes constant freezing.

[linax3-genuine]

just verified a 12GB torrent. the hard disk usage was very bad. hdd sounded bad, run at 100% and was doing only reading at very low speed. everything related to that drive was disturbed. 16gb ram almost filled by the process.

...after some testing, reverted to 4.3.9, all the semi-verified torrents verified normally, while seeding multiple torrents. no ram bloating. hdd works and sounds normally, did not even got to 100%, id guess.

[KorbenDls]

Seeing the same behavior on my system as well on 4.4.1. When checking a torrent, it was maxing out at 7 MB/s. Once I rolled back to 4.3.9 (keeping the same configuration), it's now checking at 220-230 MB/s.

[blackbeard1080]

Seeing the same behavior on my system as well on 4.4.1. When checking a torrent, it was maxing out at 7 MB/s. Once I rolled back to 4.3.9 (keeping the same configuration), it's now checking at 220-230 MB/s.

Same on 4.4.2 rolled back to 4.3.9

Can you reproduce this on windows with 4.4.2?

[linax3-genuine]

im done updating, until this debacle is long gone.
i read other issues and the developers seem to have no clue, of what they are doing.

[Orhideous]

Also stumbled upon this issue. Was able to reproduce it with 4.4.0, 4.4.1, 4.4.2 versions (libtorrent 2.x)
Changing the number of hashing threads did not bring any results.

How can I help debug this problem?

[tan-wei]

Also for 4.4.2, quite slow for checking a complete torrent.