Just a silly observation but I think you mean tortoise.
Turtles can actually move quite quickly in the right
circumstances.
As for your computers speed. There can be many reasons.
Mostly all you need to do is clear your temporary folders
once in a while and do general housekeeping to keep
Windows happy. (That is, if you are running Windows which
I assume you are). Hardware incompatibility can also be
a major influence. Check to see if you have any forced
hardware on your machine (especially graphics card or
sound card or network card). Check in you device manager
if all your drivers are correctly installed. And then as
has already been mentioned here, update all your
software. You can also download benchmarking tools from
the internet and compare your results with other similar
machines on the internet.
Good Luck