update your network and wifi drivers. if your using wifi conenction see if there any lag using wired. with any pc make sure there no malware or viruses on it. run a malware scan and make sure your anti virus is up to date. micro soft/avg/avast and a few other have free anti virus software. check with the model number on the bottom of the laptop. see if it has just the intel chipset for video or amd/nvidia. if it has a gpu check in the bios that the gpu is turned on and power savings is turned off. use gpu-z to read what video card is active.