IMHO.Using wireless (Windows 11 Acer Laptop, Intel AX201 wireless adapter), Singtel 1Gbps plan, ZTE ONT, RT-AX86U router.
No problems with upload speed.
Singtel / US West / 137.20 / 139.74, 264.10ms ping, 27.49ms jitter.
Singtel / US East / 85.29 / 102.41, 234.20ms ping, 22.23ms jitter
Singtel / EU Central / 75.66 / 94.60, 252.70ms ping, 45.19ms jitter
I tried a few times (7:10pm to 7:20pm, 31-Dec-2023) and the results are similar, no issues with upload speed.
Almost all your results are 3-digits. Could it be the plan you're on ?

