Well after a long research about such a problem *slow download speed* on a linux mint with a realtek ethernet port... i found out that alot of people have this known problem
https://unixblogger.wordpress.com/2011/10/18/the-pain-of-an-realtek-rtl8111rtl8168-ethernet-card/
so i followed that tutorial and it worked
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
Subsystem: Intel Corporation Device 5756
Physical Slot: 0-1
Flags: bus master, fast devsel, latency 0, IRQ 43
I/O ports at d000 [size=256]
Memory at e3124000 (64-bit, prefetchable) [size=4K]
Memory at e3120000 (64-bit, prefetchable) [size=16K]
Expansion ROM at e3100000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: r8168
Kernel modules: r8168, r8169
thanks for your reply anyway:(
Edit: Might be my internet speed but anyway... will check it out later on