IDM (Internet Download Manager) causing slower network transfer speed by 20%

Help & Support
1

Firstly, I am grateful that Opus 13 has finally addressed the slower network transfer performance issue for past few years between PC & NAS.

I have reformat the ssd with fresh Win11 running Opus 13 and happy with the network transfer speed. After installing some programs, i observed the file transfer speed dropped between laptop & NAS by 20%. At that juncture IDM was just installed. With IDM shutdown, the transfer speed is restored back to normal. I repeated this for a few times and was getting the same results. I decided to restart the laptop to test again.

Windows is restarted with IDM auto run. There is nothing being downloaded in the background. Copy file from the NAS is again slower to below 900MB/s as the graph below.

Restart with IDM
Restart with IDM1361×521 18.8 KB

Shutdown IDM and copy the same file again, immediately speed restored to normal 1.1GB/s as below.

Restart without IDM
Restart without IDM1365×519 23 KB

Reload IDM and run the file copy, speed dropped to <900MB/s again. Shutdown IDM the speed restored to >1.1GB/s.

This is very odd, a download manager shouldn't have affected Network Transfer Speed, it is not related to internet.

Can anyone replicate this problem? IDM is a nice download manager and quite handy in downloading video stream from just any site.

2

Another test was done using File explorer, the result showed same type of speed drop with IDM. However when compared to Opus, explorer speed is good 1GB/s for at least 45sec before dropping to ~800MB/s. In Opus, the speed dropped from 1GB/s to ~800MB/s after 10-15sec. It is not shown on previous post because Opus graph is not per whole file transfer, earlier speed graph has gone missing along the transfer. File Explorer graph is showing from beginning until the end.

With IDM in File explorer, the graph looks as below. Notice the constant speed 1GB/s for half of the graph. After that speed dropped to ~800MB/s
Exp with IDM

Without IDM in File explorer, the speed is 1GB until the end.
Exp without IDM

The same SSD is used for the test. Could it be the way of using RAM in file transferring that Opus cannot sustain full speed long enough compared to File Explorer? The laptop has 96GB ram.

3

This is really something you should take up with IDM, especially since it seems their software is affecting Explorer as well.

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