I've been dealing with this problem for 2-3 days. It doesnt affect gameplay or performance. It is just usual and I believe it is related to console commands.
related video
btw here I got around 60 fps (I guess bcz of the fraps) but it is same @ 130-140 fps. This is how it should look like @0:09
And this is my current config which I took via host_writeconfig
http://pastebin.com/5YPaqtJY
Best Answer
Can you describe the lag you're talking about?
Most of the HP(High-Power) weapons have a delay before using them because they are high damage.
I.E. AWP (Magnum Sniper Rifle) takes about 0.7 seconds before the first shot can be taken and has a reload time of 0.9-1.4 seconds between shots.
OR
are you having issues between scrolling the mouse wheel and the weapons are not fast-switching?
Follow these steps (working on knowledge from CS:S):