Slow download site-to-site VPN

[Tomas3miasto]

We have had a problem downloading files via a VPN tunnel for some time now.
When I download a file from the headquarters to our office, our speed is about 15MB/s (sometimes more at startup, but after a while, it drops).
If I were uploading the same file (I am testing on a 1GB file) to the headquarters, the speed would be about 50MB/s.

Has anyone had a similar case?
I'm trying to diagnose it but so far without success.

Tomasz

[Lesley]

Site to site? Or client vpn? What encryption methods are used? Make sure not to use for example slow performance methods like 3des. What blades are enabled on the gateway 

[Tomas3miasto]

site to site. Meshed Community

 I have disabled almost all blades on my site. Now I have fw, vpn, anti_bot

[Lesley]

Try to move away from md5 and 3des not secure and cpu intens. Then test again. Could also be software bug what is cpinfo -y all output?

[the_rock]

I would refer to below sk.

Andy

https://support.checkpoint.com/results/sk/sk73980

[Timothy_Hall]

Almost certainly a sub-1500 MTU somewhere in your network path between the peers, see:

sk98074: MTU and Fragmentation Issues in IPsec VPN

Command tracepath run from one peer to the other can be used to confirm a low MTU is present.