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High resource usage in gnome-shell & cairo-dock

The result of my top command looks something like this

1602 rafee     20   0 2055200 296508  38540 R  99.7  7.7  46:38.43 gnome-shell                                                                       
 1726 rafee     20   0  944000  87364  19836 R  99.7  2.3  47:51.70 cairo-dock                                                                        
 5141 rafee     20   0 1665872 670120  48660 S  13.6 17.5   8:00.00 firefox                                                                           
 3949 root      20   0  204352  24788   8400 S   1.3  0.6   0:44.65 Xorg                                                                              
 5834 rafee     20   0  647312  20196  13208 S   0.7  0.5   0:01.36 gnome-terminal-                                                                   
 3749 root      20   0       0      0      0 S   0.3  0.0   0:03.29 kworker/2:0                                                                       
 4292 rafee     20   0 2165180 391844  43860 S   0.3 10.2   1:03.46 gnome-shell

Here the 99.7% column is cpu & 7.7% column is memory.

The specification of my computer is as follows

Intel corei3-330M
4 GB memory
1 GB Nvidia gt325m(have not installed driver, because it tends to mess with system)

Can anyone explain whats going on here? Is this type of resource usage normal?