Recently, my laptop started slowing down a lot more than usual, where it took more than 5 minutes to load Visual Studio (Before, it only took at max 30 seconds).
so I ran an HDTune Benchmark:

This is a 750 Gig 5400RPM SATA Laptop Harddrive.
My impression was, for non-ssd drives, the benchmark result should look like a curve, starting from the top.
However, this result seems very sproadic, minimum being 0.3, maximum 97 and average 33.
Does this mean I need to replace my HDD?