poor 3D performance

[La Temperanza]

Hello again. I've got a Duron 950 with 256MB RAM and a Radeon 7500 with 32MB vmem, running 4.7-STABLE up-to-date as of a few days ago, and I can't figure out why 3D games like bzflag are running at almost unplayable frame rates. I have the drm-kmod port installed, my video card is detected properly and DRI is loading correctly... can anyone throw me some suggestions?

Here's the output of glxinfo:

name of display: :0.0
display: :0 screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.2
server glx extensions:
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context
client glx vendor string: SGI
client glx version string: 1.2
client glx extensions:
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context
GLX extensions:
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context
OpenGL vendor string: VA Linux Systems, Inc.
OpenGL renderer string: Mesa DRI Radeon 20010402 AGP 1x x86/MMX/3DNow!
OpenGL version string: 1.2 Mesa 3.4.2
OpenGL extensions:
GL_ARB_multitexture, GL_ARB_transpose_matrix, GL_EXT_abgr,
GL_EXT_blend_func_separate, GL_EXT_clip_volume_hint,
GL_EXT_compiled_vertex_array, GL_EXT_histogram, GL_EXT_packed_pixels,
GL_EXT_polygon_offset, GL_EXT_rescale_normal, GL_EXT_stencil_wrap,
GL_EXT_texture3D, GL_EXT_texture_env_add, GL_EXT_texture_env_combine,
GL_EXT_texture_env_dot3, GL_EXT_texture_object, GL_EXT_texture_lod_bias,
GL_EXT_vertex_array, GL_MESA_window_pos, GL_MESA_resize_buffers,
GL_NV_texgen_reflection, GL_PGI_misc_hints, GL_SGIS_pixel_texture,
GL_SGIS_texture_edge_clamp
glu version: 1.3
glu extensions:
GLU_EXT_nurbs_tessellator, GLU_EXT_object_space_tess

visual x bf lv rg d st colorbuffer ax dp st accumbuffer ms cav
id dep cl sp sz l ci b ro r g b a bf th cl r g b a ns b eat
----------------------------------------------------------------------
0x23 24 tc 0 24 0 r y . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x24 24 tc 0 24 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 Slow
0x25 24 tc 0 24 0 r y . 8 8 8 8 0 24 0 16 16 16 16 0 0 Slow
0x26 24 tc 0 24 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 Slow
0x27 24 dc 0 24 0 r y . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x28 24 dc 0 24 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 Slow
0x29 24 dc 0 24 0 r y . 8 8 8 8 0 24 0 16 16 16 16 0 0 Slow
0x2a 24 dc 0 24 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 Slow



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