I'm not all there when it comes to networking so here I am

I'll need 40m of cable from the router to my TV, my 2TB WD NAS is connected to the router using a short cat 6 Ethernet cable.
TV model number is 55UB820V and plays smaller files like 3gb episodes perfectly, but once I try to watch a decent quality movie that's let's say on average 15GB then it always results in loading every minute for a few seconds.
The question is, with it being 40m do I need cat 6 or will 5e be fine? I can have a family member install 5e for next to nothing, they don't monitor how much of that stuff gets used where he works but if I wanted cat 6 I'd have to pay for the cable. I don't mind paying, that's no issue but if 5e is fine then I'd rather go that route and avoid the extra cost of cat6.


I'll need 40m of cable from the router to my TV, my 2TB WD NAS is connected to the router using a short cat 6 Ethernet cable.
TV model number is 55UB820V and plays smaller files like 3gb episodes perfectly, but once I try to watch a decent quality movie that's let's say on average 15GB then it always results in loading every minute for a few seconds.
The question is, with it being 40m do I need cat 6 or will 5e be fine? I can have a family member install 5e for next to nothing, they don't monitor how much of that stuff gets used where he works but if I wanted cat 6 I'd have to pay for the cable. I don't mind paying, that's no issue but if 5e is fine then I'd rather go that route and avoid the extra cost of cat6.