Craftjenn
In fact, I saw that ryzom client use mainly only 2 cores (my PC have 8).
One on them (n°5) was regularly at 100%, while the other ones do nothing (2-3%)... only when I launch Ryzom
I use a gnome extension, for power management (cpufreqctl), and I noticed that if I cut the boost, it seems better...
The game client is badly optimized for "new computers". It's mainly due to NeL. I doubt this will change in a near future tbh. Basically it will require a full revamp of the engine (yes, I am making a shortcut here).