Why would you want to change the BIOS? You have to have a good reason to do so, cause if it's going mad, you are screwed for real!! Every manufacturer says to update it only if you have BIOS related problems.
HOW LATE ...? try ... install software Registry cleaner , disable not important data, delete all temporary file *.tmp, disable automatic update, disable auto scan anti virus ...
if WANT FASTER : get New SODIMM with more Size according support your Laptop
backup important data, make recovery system + keep driver , clean your Laptop , call professional after that install fresh OS + Driver