My machine has always handled browsers in what I consider to be normal manner. Click a link and within a second or two the (called for) page is loaded. Until a couple of days ago web browsing has been more than satisfactory.
I presently have a major issue calling up any website or page. From the moment I click the link to the time the page loads can be 15-20 seconds and in some cases much longer. This happens with all the major browsers. I normally use Chrome.
I have a home wireless network using an Asus RT-N66U wireless modem. It provides wireless signal to 5 computers (3 laptops, two workstations) and my son's Xbox. I have run "http://www.speedtest.net/" on all machines (not Xbox) and other than on this machine I am consistently getting 40-50 mb/sec download speeds (I pay for 50). On this machine "speedtest.net" won't even measure or provide speed information.
The wireless adaptor in this machine is a D-link DWA-552 installed in a PCI bus on an ASUS P7P55D-E Pro motherboard. In order to determine if this adaptor was the problem I disabled it and plugged in an Asus USB-N53 adaptor I normally use on my other workstation machine (on it I get the 50 mb/sec download speed so I know the Asus adaptor is good).
With the D-link disabled and the Asus enabled as the functioning adaptor I get no increase in performance. Both adaptors are identical in their performance. This leads me to believe that Windows 7 or another piece of software is responsible.
For many years I have run Iolo's System Mechanic Professional and presently use the latest version 22.214.171.1245, as a result I have always enjoyed a machine that runs near to flawless (until now). I also run MalwareBytes Anti Malware now and then for added system maintenance.
I believe my browser problem started about the time I upgraded System Mechanic Pro and at the same time removed a program I'd installed several weeks earlier for evaluation. It was called YAC (yet another cleaner). CNET claimed it was an excellent all round maintenance program.
I have done as much troubleshooting as I am capable of and find I need the help of someone who really understands how to find the problem and then help me fix it. That would be very much appreciated.
Additional information: Windows 7 Professional version 6.1.7601 Service Pack 1 Build 7601, Intel Core i5 firstname.lastname@example.orgGHz, 16 GB installed RAM,