Jumplist problem in windows 7 x64

hi i`m using windows 7 x64 sp1 Pro . and NIS 2011 18.5.0.125 

i don`t know why norton antivirus will make a delay in some programs in jumplist . for exaple i pined googe chrome and explorer and some other programs in my taskbar , when i right click at google chrome , jumplist will come up so fast , but explorer and some other programs have delay , in all of them jumplist will come up soon but in explorer and some others renects have delay , if i disable antivirus my problem will be solve. i saw others have this problem too , don`t know wjy norton didn`t fix it yet

please help me