Guild Leader: Battoth
Guild Name: The Dao

Correct, the d3d9on12 is already installed on windows 10/11 (by Microsoft) so the dll just forces eq to render through dx12.

Microsoft also released d3d9on12 as an open source project on git if you are curious how it works, see https://github.com/microsoft/D3D9On12

A tip for those with lagging graphics or high gpu load

There is a Microsoft project called D3D9on12 that allows you to map directx 9 calls to use directx 12 this is an opt in driver.

https://github.com/narzoul/ForceD3D9On12

This project forces applications to use the mapping library.
Just download the release and drop the d3d9.dll into the everquest folder,

For me all graphics lag is gone, no measurable gpu load each client is 0% in taskmanager, it uses an extra 100mb of ram for me but the complete lack of stuttering makes it more than worth it

It's not a crash it is the server ratelimit on packages sent to client.

You need to enable ServerFilter=1 in your eqclient.ini and then remove as many filters in your alt-o settings ingame.

That will stop the dc to char server