Hi. My friend complains that his PC is slow when multiple browser tabs are open for a longer period of time(Chrome, 30+ tabs). He often have many Youtube links open and pages like flashscore, where there is an automatic refresh. His PC specs are: Intel G860, 4 GB ram, 120 gb ssd. Task manager shows that cpu is 100% on both cores. Would it help to buy extra ram or is a new CPU needed? His budget for an upgrade is 300$ and main PC usage is browsing and watching movies. Thanks.