I had this problem too

1) If you have a DSL, try rebooting it

2) Don't download porn while playing quake (i mean any movies, music, etc.. it will make you lag)

3) It may be cause by a low framerate. Type \cg_drawFPS "1" in your console to see your # of frames per second. If it is low (~20 FPS or lower when there are like 10 players in the game) you'll get many "connection interrupted".

This might help you (cvars + explanation) :

seta cg_bobroll 0 // Player vision bobbing roll
seta cg_bobpitch 0 // Amount player view bobs forward/back while moving
seta cg_bobup 0 // Amount player view bobs up/down while moving *might be cheat protected*
seta cg_runroll 0// Amount player view rolls side to side while moving
seta cg_runpitch 0 // Player vision bobbing pitch while running

seta cg_shadows "0" // Disables player shadows
seta cg_marks "0" // disables marks on walls
seta cg_gibs "0" // Body parts when you frag someone [GREAT FOR IMPROVING YOUR FPS!!]
seta com_blood "0" // Disables blood [GREAT FOR IMPROVING YOUR FPS!!]
seta r_dynamiclight "0" // Disables dynamic light effects : YOU CAN GAIN UP TO 20 FPS!!

and if your vid card is cack :

seta cg_simpleItems "1" // Simple items instead of 3D animated items
seta cg_draw3dIcons "0" // 2D icons in HUD

seta r_picmip "read " // Texture quality : 1 : default, 0 : best quality, lowest fps, higher (2-16) = lower texture quality; higher FPs [16 is real lame but great for FPS + aiming ]

seta r_lodbias "2" // (LOD = level of detail) 0 = normal ; 2 = lower quality, higher FPS

seta r_fastsky "1" // Fast sky or high quality !!!you can't see thru portals using a fast sky!!!, you can do that : \bind <key> toggle r_fastsky

seta r_subdivisions "999" // Set the number of subdivisions used in rendering curved surfaces increasing this number will improve FPS

I think thats all, hope you can figure this out

ok

if you ever have a big lag trouble like this, try lowering you screen resolution to 640*480 by doing \r_mode 3 then \vid_restart. If you don't lag anymore it means the problem was your low frame rate

see ya

Try On Console

\snaps 40 or 30 or 20

Hmmmmmmm,I play Q3 on my old 500 Mhz PC with G4 MX and got no problems.I dont think that he have to reduce all the things that let Q3 look good(like blood or gibs etc. .The problem must be something else.