YouTube playback on iMac 2009

[leolb2615]

I have recently upgrade my 21,5" 2009 iMac with an SSD and 8GB RAM. Works perfectly for me, and with Ethernet pages load really fast. I am currently writing on the computer right now and it works fine. Just when I try YouTube playback it starts stuttering. 1080p60 is not good. Freezes up every 2-3 seconds. 720p is ok, but it still seems stuttery or "frameratey". I don't want to lower the resolution any more because going lower doesn't look good at all on a display with this size. It has 3,06 GHz Intel Core 2 Duo and Nvidia GeForce 9400 Graphics. Shouldn't it be capable of running video better than this? I am on Firefox on High Sierra 10.13.6. I have already tried h264ify.

For example with 1080p60:

Any tips?
Thanks,
Leo

 

[EugW]

Install an ad blocker.

For p60 content on a Core 2 Duo Mac with GeForce 9400, I recommend 720p, if h264ify or Safari doesn't work.

 

[leolb2615]

Ublock Origin is installed. The preformance seems much better after shutting the computer down over the night. Today 1080p60 works fine.

 

[TheShortTimer]

Ublock Origin is installed. The preformance seems much better after shutting the computer down over the night. Today 1080p60 works fine.

I also have uBlock Origin installed and it's the best one that I've ever used.