I think this is this real bottleneck, not the memory.
no, your wifi is fine, speed test speeds should only be as a test and not as complete fact as many factors go into testing speed on https://speedtestfast.com. 30mbps is not a bad speed from a speed test, mtu is for pactet size; 1400 to 1550 are a good range, do note any size above 1500 could be marked as a jumbo packet and could be dropped by your router/modem thinking there bad traffic. packet size could improve dl speed but it add over head to your local network
no, your wifi is fine, speed test speeds should only be as a test and not as complete fact as many factors go into testing speed on https://speedtestfast.com. 30mbps is not a bad speed from a speed test, mtu is for pactet size; 1400 to 1550 are a good range, do note any size above 1500 could be marked as a jumbo packet and could be dropped by your router/modem thinking there bad traffic. packet size could improve dl speed but it add over head to your local network