>  2OP: какую скорость показывает
>    __GL_SYNC_TO_VBLANK=1 glxgears
>  ?
art...@nextlife:~$ export __GL_SYNC_TO_VBLANK=1 && glxgears -info
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
GL_RENDERER   = GeForce4 MX 440 with AGP8X/AGP/SSE2
GL_VERSION    = 1.5.8 NVIDIA 96.43.18
GL_VENDOR     = NVIDIA Corporation
GL_EXTENSIONS = GL_ARB_imaging GL_ARB_multitexture GL_ARB_pixel_buffer_object 
GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_shader_objects 
GL_ARB_shading_language_100 GL_ARB_texture_compression GL_ARB_texture_cube_map 
GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_dot3 
GL_ARB_texture_mirrored_repeat GL_ARB_texture_rectangle GL_ARB_transpose_matrix 
GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader 
GL_ARB_window_pos GL_S3_s3tc GL_EXT_texture_env_add GL_EXT_abgr GL_EXT_bgra 
GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_subtract 
GL_EXT_clip_volume_hint GL_EXT_compiled_vertex_array GL_EXT_Cg_shader 
GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_gpu_program_parameters 
GL_EXT_multi_draw_arrays GL_EXT_packed_pixels GL_EXT_paletted_texture 
GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_rescale_normal 
GL_EXT_secondary_color GL_EXT_separate_specular_color 
GL_EXT_shared_texture_palette GL_EXT_stencil_wrap 
GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map 
GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 
GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod GL_EXT_texture_lod_bias 
GL_EXT_texture_object GL_EXT_vertex_array GL_IBM_rasterpos_clip 
GL_IBM_texture_mirrored_repeat GL_KTX_buffer_region GL_NV_blend_square 
GL_NV_fence GL_NV_fog_distance GL_NV_light_max_exponent 
GL_NV_packed_depth_stencil GL_NV_pixel_data_range GL_NV_point_sprite 
GL_NV_register_combiners GL_NV_texgen_reflection GL_NV_texture_env_combine4 
GL_NV_texture_rectangle GL_NV_vertex_array_range GL_NV_vertex_array_range2 
GL_NV_vertex_program GL_NV_vertex_program1_1 GL_SGIS_generate_mipmap 
GL_SGIS_multitexture GL_SGIS_texture_lod GL_SUN_slice_accum 
298 frames in 5.0 seconds = 59.466 FPS
299 frames in 5.0 seconds = 59.762 FPS
155 frames in 5.1 seconds = 30.446 FPS
47 frames in 5.1 seconds =  9.203 FPS
46 frames in 5.1 seconds =  9.063 FPS
48 frames in 5.0 seconds =  9.573 FPS
205 frames in 5.0 seconds = 40.906 FPS
^C

9 - разворачивал на полный экран.

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