My lappy was having some heavy CPU usage with 2 clients, maybe a different issue than yours. I did 3 things that im not sure which one did help
-ryzom config tool -> general -> advanced -> slow down the game
-updated display driver
-changed display driver type to opengl
I hope it helps
-ryzom config tool -> general -> advanced -> slow down the game
-updated display driver
-changed display driver type to opengl
I hope it helps