On multiple models of Jetstream switches, including TL-SG3428 and T1600-28PS (>=v3 only, v1 and 2 are ok), I've noticed that rate limiting a port results in it running extremely slowly regardless of the rate limit speed chosen. For example, if I rate limit to 499968Kbps in both direction on a single port, and then test the speed using iperf the result is 8.26 Mbits/sec. If I run the same iperf without rate limiting it's up to 900Mbps.

I posted about this once before here in relation to the T1600G v3 models, but ended up using v1 models off ebay as a workaround. Now a year later I want to use new hardware and assumed the TL-SG3428 wouldn't have the same issue, but sadly it does! I know it's not a config mistake on my part as the same config works perfectly on T1600G v1 models.

Attached are some screenshots showing results.

Question is, how and should I bother reporting this to TP-Link? Do they fix issues like this or should I change brand?