How to enable hardware acceleration in FreeBSD?

I've a computer which has some limited hardware. It's specs are these. AMD 64 Athlon 3000+. Nvidia FX 5700 256MB. 512MB RAM DDR x2 = 1024MB. I have installed on it FreeBSD 12.1 RELEASE-p6 GENERIC i386 with the LXDE Desktop. When the LXDE desktop wants to use a screensaver which has 3D images, the CPU starts using a lot of it's resources, like 100%, and even the 3D images goes like slow. This happens too if I move a Window in the Desktop. I think this is a hardware acceleration problem, and I would like some help to be able to fix this if it's possible. When I do a dmesg | grep agp, appears this. agp0: on hostb0. Doing a cat /var/log/Xorg.0.log | grep "Direct Rendering" doesn't give me anything. I'm trying to use these old computers as servers for my own projects that I have. They are just machines with some Java code as back-end. I would like to use the GUI instead of CLI because it helps me work more faster. Using Windows XP leaves me with security holes and incompatible software, which doesn't help too much, even if the machine has the hardware requirements. At least what I would like to do is to not get the processor so high, when moving the windows and all that stuff. Maybe installing a reverse-engineering Linux driver of that graphics card could help ? Or Installing a Linux distribution ? I'm not an expert on servers, but I think that for example if I access into the Window Manager to make some changes in GUI mode, and the service is still running, isn't gonna get the service more slow because of the CPU using it's resources for the display while I'm doing the changes ? Isn't it more better to use the resources of the graphics card for the display of the Window manager or desktop ? Thank you for your possible help, at least I would like to not stress a lot the CPU when using the Window Manager or desktop. Cheers.