Extreme lag with relatively normal speed on speedtest

My friend is having extreme lag playing this game despite having relatively normal speed on speedtest, not really fast speed but she has no problems playing other MMOs. Her speed I believe is around 10mbps, which is perfectly normal for the garbage internet we have here in Canada. In fact I’m on around 10-12mbps always, and I have a constant 120-150ping, which is playable. Her lag is so bad that even running around is a problem, rubberbands constantly with up to 10sec of lag spikes, and combat is pretty much completely impossible.
Anyone have a clue how to diagnose and fix this?

Her specs:
ASUS N550JV
CPU: Intel(R) Core(TM) i7-4700HQ CPU @ 2.40GHz (2394.47 MHz)
Memory: 8076 MB
OS Version: Microsoft Windows 8.1 64-bit (Build 9600)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce GTX 850M/PCIe/SSE2
Windows Graphics Driver Version: 10.18.0010.3355
OpenGL Version: 4.5.0 NVIDIA 347.25

She does not have Asus GameFirstService, which some people claims to fix lag if turned off.

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