Slow computer: what to check first
First check free disk space: a full disk slows the system down.
Startup programs
Disable unneeded programs that launch with the system.
SSD instead of HDD
Replacing an old HDD with an SSD is one of the most noticeable speed upgrades.
Viruses
Suspicious software and adware extensions also slow things down. If you cannot handle it yourself, contact a specialist.