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Network file transfers much slower than expected (seems to be limited to 100mb/s?)

I've had a NAS running windows server for a while now and initially speeds were fine (maxing out the 1gb/s when transfering large files) but now for some reason when copying a file to the NAS it sits at almost exactly 100mb/s (10-12MB/s) and won't transfer any faster (both devices are on the same LAN and using iperf the link speed is ~800-900mb/s)

Both drives should easily be capable of faster speeds especially for large files, copying the same file from the HDD it's on to the ssd in the same machine copies at ~60-70MB/s and the NAS can copy that file at over 600MB/s..

 

any ideas?
image.png.a2261ff5391db149b1a729180686785f.png

 

Edit: and for anyone wondering even copying from the NVMe SSD in the laptop to the NAS is still the same speed.

Current:
Eluktronics THICC-17 (Clevo X170SM-G):
CPU: i9-10900k @ Up to 5.3GHz (4.8GHz) all cores 
GPU: RTX 2080 Super (Max P 200W) @ 2025MHz
RAM: 32GB (4x8GB) @ 3200Mhz

Storage: 512GB PRO-X-G2R NVMe SSD, 4TB WD Passport USB-C
Displays: IPS 1080p@240Hz (G-Sync), Asus VG248QE 1080p @144hz, 2x Dell SE2417HGR 1080p @60Hz

Dell Poweredge R720 (Server):
CPUs: 2x Xeon E5-2667v2 @ 3.6Ghz all cores
RAM: 120GB (15x8GB) @ 1333Mhz

Storage: 1x Intel 160GB SATA III SSD, 15x Seagate SAS Enterprise 1TB HDD in RAID 6

 

Old:

Eluktronics Mech-17 G1Rx:
CPU: i7-9750h @ 4.0GHz all cores
GPU: RTX 2070 @ 2004Mhz/(~1650Mhz)
RAM: 16GB (2x8GB) @ 2666Mhz
Storage: 512GB HP SX920, 4TB WD Passport USB-C
Displays: BOE NV173FHM-N44 1080p@144Hz, Asus VG248QE 1080p @144hz, 2x Dell SE2417HGR 1080p @60Hz
Custom SFF AMD Sleeper (Parted out and sold/sent to friends)
Dell Precision M6700 (both GPUs died, among other issues, officially shelved for now...)

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some device along the way is only running at 100 megabit, either your desktop, a switch/your router, or the nas itself.

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2 minutes ago, manikyath said:

some device along the way is only running at 100 megabit, either your desktop, a switch/your router, or the nas itself.

That's what I thought but everything should be gigabit (both computers report as gigabit and I know the switch is gigabit). That was why I tested with iperf and saw speeds well over 100mb/s (around 800-900mb/s)

Current:
Eluktronics THICC-17 (Clevo X170SM-G):
CPU: i9-10900k @ Up to 5.3GHz (4.8GHz) all cores 
GPU: RTX 2080 Super (Max P 200W) @ 2025MHz
RAM: 32GB (4x8GB) @ 3200Mhz

Storage: 512GB PRO-X-G2R NVMe SSD, 4TB WD Passport USB-C
Displays: IPS 1080p@240Hz (G-Sync), Asus VG248QE 1080p @144hz, 2x Dell SE2417HGR 1080p @60Hz

Dell Poweredge R720 (Server):
CPUs: 2x Xeon E5-2667v2 @ 3.6Ghz all cores
RAM: 120GB (15x8GB) @ 1333Mhz

Storage: 1x Intel 160GB SATA III SSD, 15x Seagate SAS Enterprise 1TB HDD in RAID 6

 

Old:

Eluktronics Mech-17 G1Rx:
CPU: i7-9750h @ 4.0GHz all cores
GPU: RTX 2070 @ 2004Mhz/(~1650Mhz)
RAM: 16GB (2x8GB) @ 2666Mhz
Storage: 512GB HP SX920, 4TB WD Passport USB-C
Displays: BOE NV173FHM-N44 1080p@144Hz, Asus VG248QE 1080p @144hz, 2x Dell SE2417HGR 1080p @60Hz
Custom SFF AMD Sleeper (Parted out and sold/sent to friends)
Dell Precision M6700 (both GPUs died, among other issues, officially shelved for now...)

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