Disable html motd's.
Are you using any custom cfg's/huds/materials etc.?
What laptop are we talking about here? Please give us the full laptop name and/or it's specs.
Quick edit:
-Have you scanned your pc for issues?
-Do you only have issues in tf2 or does this cover say, all source/steam games or even all programs on your computer.
-Are your drivers up to date?
-Have you checked task manager and your AV for programs that eat up system resources?
-Do you have multiple anti viruses?
Looking through these things would be a good start of things to check as this will eliminate a lot of the possible options to prevent us from playing the guessing game.