I would open up a command line and run the ping command to see if you are seeing packet fragmentation, it's fairly easy to check. I have a old netgear (purchased in 2010) router and had the same issue. It's really simple to check for fragmentation. the Ping command that you need is "ping google.com -f -l 1472" If the result states that "Packet needs to be fragmented but DF set" then you need to change your MTU.
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