Malware laptop lag on start up

hi guys - got a toshiba satellite s50-b-15f 1080p laptop with windows 10 64 bit , 8gb ram, 256 gb ssd, when i start my laptop up from cold it seems to lag when loading web pages etc..sometimes it happens when im browsing the web or doing some downloading, the fan kicks in,,etc...see video,will put it up in a bit or a link to it.. wventually everything wiill be as normal...any ideas, its still under warranty, paid over £500 for a few months ago, anyway i can check if hardware failiure is imminent ?