Sony vaio fs315e running slow

I would scan with malwarebytes.

malware bytes would be a good measure, how about anti-virus? do you have something running? when was last time you've done a full scan?

also check out your processes, things like browser plug-ins and malware like to run things in background taking up the resources.

if you're not sure if the process is good or bad refer to windows defender or hijackthis website

check the health of your HDD, chances are you might need a defrag or scan disk

check your admin logs in control panel for any issues

check your running temperatures, if CPU is running hot it might be cutting back on performance

you didn't mention what OS you're running.

chances are, that laptop is not very new, as things get older even OS'es get clunkier with regular updates and things that might have moved faster before take a little longer.

if it's not too much trouble for you, I'd try a clean reinstall.

ask if you have trouble with anything I've mentioned.

Note: there might be your are under "low performance" mode, switch it to "high performance" and it might help resolve the issue easily.

If this is not the cause, then it can be caused by many reasons such as outdated hardware, overload startup programs, corrupt registry issues, too many junks, virus attack, poor security software taking too much system resources, remnants of uninstalled applications etc. The fact is, you should keep some system maintenance job regularly. See this site sony vaio slow for more fix info.

Meanwhile, upgrading hardware configuration such as add RAM, change a new video card, larger-volume HDD etc can be a fast yet effective way to improve your pc performance. But that won't be the most economical.