topic Checkpoint VPN Slowness issue in General Topics

Checkpoint VPN Slowness issue

SecurityNed — Wed, 27 Aug 2025 05:23:43 GMT

Hello everyone,

We are facing a performance issue with a new VPN deployment. The VPN connection is successful, but remote users are experiencing extremely slow access to internal resources, such as file servers. It's taking a very long time (several minutes) to open even a small file.

We have already tried adjusting the MTU value on the external interface, but this caused stability issues on the local network, so we had to revert the change.

Has anyone encountered a similar issue with a new VPN deployment? What are some of the common causes for this kind of slow performance, and what troubleshooting steps would you recommend?

Any insights or suggestions would be greatly appreciated.

Thank you.

Re: Checkpoint VPN Slowness issue

Lesley — Wed, 27 Aug 2025 07:43:43 GMT

Most of the time it is because you use slow encryption methods like 3DES. Share please from Smart Console -> Global properties -> Remote Access -> VPN - Auth -> Edit

I would change to: aes256 and sha256 for p1 and p2! Older clients might not be able to connect (ancient versions)

Re: Checkpoint VPN Slowness issue

HeikoAnkenbrand — Wed, 27 Aug 2025 07:53:30 GMT

With the following command you can test and compare all encryption methods. After these results I would always recommend to activate AES-NI and AES is preferred to 3DES because it offers many performance advantages through the hardware acceleration.

Warning notice: If you execute this command you have 100% CPU usage on the gateway for a long time!

# cpopenssl speed

More read here:
R8x - Performance Tuning Tip - AES-NI