Resolved Slow performance after securing websites with Lets Encrypt SSL

[Jeroen Vermeulen]

Hi!,

Recently my VPS with CentOS and Plesk 12.5 died.
I manually moved all websites to a new VPS.

OS ‪CentOS 6.9 (Final)‬
Plesk version 12.5.30 Update #74

I am using Lets Encrypt for all my websites.
I have around 45 Joomla websites, 30 Wordpress websites and some miscellaneous.
Right from the start, I saw that performance is slow on all websites.
The first TTFB is very bad.
After disabling SSL, performance is way faster.

Please see image.
I deleted some information from the image that shows personal information.

Do you have any idea where I should look for the problem?

Thank you.

 

[MarkM]

Few things I would suggest; I'd check to make sure they are all using the latest version of PHP. In addition, I would check to make sure keep-alive is enabled.

Is this a virtual machine by chance? If so, you may want to experiment with the different network drivers.

 

[Jeroen Vermeulen]

Thnx for your reply!

The websites use the latest version of PHP.
How can I check if keep-alive is enabled? I see some information on internet, but nothing recently combined with Plesk.

It's a VPS at a well known dutch hosting company. The old server didn't have this.

 

[Bitpalast]

you may want to experiment with the different network drivers.

I am impressed. Indeed this is a very likely source of issues in this case. The hosting company needs to advise on it, though, because changes to these drivers could easily take the system offline.

 

[MarkM]

Whoops forgot about this until Peter bumped it LOL. What type of virtualization do they use?

 

[Jeroen Vermeulen]

VMWare vSphere

 

[MarkM]

Check with your host and verify your network adapter type is VMXNET 3 which would be the best practice. E1000 is what the common default is. You should see your performance improved dramatically if this is the case.

 

[Jeroen Vermeulen]

It's already on VMXNET3. I just called them and I can also see it in the vSphere Web Client.

Check with your host and verify your network adapter type is VMXNET 3 which would be the best practice. E1000 is what the common default is. You should see your performance improved dramatically if this is the case.

 

[Jeroen Vermeulen]

Hi all,

I don't understand but this issue fixed itself.
I didin't change anything.

Please see image.

Topic closed!