USB wireless utility using a lot of resources

Hey guys, my browser has been slow lately (firefox) and I decided to check how much memory it was using when I noticed the adapter I use to conect to internet it's taking way more. Im using a Trendnet TEW-644UB to get signal from my router because I dont have the airport card on my computer and only that usb adapter is taking around 23% of cpu. What can I do to fix the problem? Should I just get rid of the adapter? is there any other cheap solution?
Please look at the picture and tell me if that's normal or bad
thanks!

I wanted to add something that I left out.  I was focused on the CPU load thing, yet you mentioned slow browsing speeds as well.  These two things may or may not be related.  As far as slow browsing speeds go, I should have run you through some cursory steps to help isolate the problem.  Before we do that, it is always wise to power cycle all your internet devices first to see if that solves the problem.  So power-cycle all your internet devices.  If you don't know how, let me know. 
Following a successful power-cycle and you are back online, check your browsing speeds.  Still slow?  From here we should check to be sure that the problem does not lay with your ISP.  We do this by taking your Wi-Fi router out of the equation.  Disconnect your Trendnet USB device, and connect an ethernet cable directly into your modem (not your router).  Now disconnect the power on the modem.  Wait 60 seconds.  Now plug the power back into your modem.  Wait for it to initialize.  Now check your browsing speeds.  Chances are you will not have slow browsing speeds with this configuration.  On the outside chance you do, then we know not to blame your Trendnet USB device rather your ISP. 
The next step would be to introduce your Wi-Fi router into the equation.  So you will disconnect your ethernet connection and reconnect everything the way it was originally.   Power cycle all the devices and check your browsing speeds while you are in close proximity to your router.   If your speed is better, then this may simply be a reception issue with the Wi-Fi. 

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