Top 3 Ways to Solve Windows Server 2019 Slow File Sharing

This essay has presented the top 3 ways for you to solve Windows file share slow performance. You can apply to each one of them to tackle this task with ease and improve the file transfer efficiency.


By Miya Updated on October 27, 2023

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User case


How to fix Windows Server 2019 slow file sharing

I am having a weird issue where my server 2019 domain controller that is hosting a file share cannot send files over the network at more than 30mbps I have a gigabit card in there and it has 4 vCPUs and 10 gigs of RAM in never was this slow before it just started doing it. Does anyone know a better way to resolve the issue?

- Question from Microsoft Ignite

What causes Windows file share slow performance?

If multiple computers are on the same LAN, file sharing is usually set up to share resources, facilitate the transfer of information, and improve work efficiency. However, some users find that accessing shared folders is slow after using the file sharing function in the computer system. What are the causes of this situation?

Computer processors, memory sizes, hard drive read/write rate, remaining hard drive space, etc. can all contribute to slow file sharing. For example:

♣ CPU. To share small files, most computers do not make much difference, but encounter large files, of course, the better the processor, the faster the transfer.
♣ Memory. The larger the memory, the smoother the operation.
♣ Hard drive. The reason why the hard disk is upgraded from IDE to SATA is to improve the speed of transmission, so the hard disk interface has an impact.
♣ Network: Of course, if it is a remote transfer, but also related to the speed of the network. If it is within the same partition, the transfer is definitely faster, and the speed between the same partition is much faster than the transfer speed between partition and removable storage.

So is there any way to solve such an issue? Don’t worry, in this post, you will gain the most effective 3 ways to settle this problem effortlessly.

How to solve Windows file sharing slow problem in Server 2019

Since you already know the possible causes of slow Windows Server 2019 file transfer speed, now you can choose one of the 3 methods I have summarized for you to boost the speed of server computer file sharing. Here, you are allowed to change the system settings by disabling Large Send Offload and NetAdapterRSC, or you can directly rely on a professional third-party tool to make it faster to share files. Choose one that suits you most according to your needs.

#1. Disable “Large Send Offload (LSO)”

Large Send Offload is a technique for improving network performance while at the same time reducing CPU overhead. Apparently, it does not work very well, so it is suggested to disable it. I’ll show you how to work on it.

1. Go to Control Panel> Device Manager> Network Adapters.

2. Under Advanced tab, select Large Send Offload V2 (IPv4) and set the value to Disabled. Do the same for Large Send Offload V2 (IPv6) if it is available.

Disable LSO

#2. Disable-NetAdapterRSC

Receive Segment Coalescing (RSC) is an offload technology that can help reduce how much of the CPU is used in network processing, which may also be one of the reasons that cause slow file transferring.

Follow the steps below demonstrating running the Disable-NetAdapterRsc on a Server 2019 machine with minimal loss of pings and file transfers auto restarting.

1. Run Windows PowerShell as Admin, check if AdapterRSC is enabled using this code: GetNetAdapterRSC. True=Enabled and False =Disabled.


2. If it is True, type the code disable-netadapterrsc to disable AdapterRSC.

Disable NetAdapterRSC

3. Check again to confirm that is successfully disabled using the code GetNetAdapterRSC.


With the above treatment, Windows Server 2019 users can access the shared files on the LAN again after restarting the computer and you will find that the speed immediately improves a lot and double-clicking into the shared files is no longer slow.

#3. Use the best file transfer tool to speed up file sharing 

If you deem that it is a hassle to change these settings, you’ve tried these methods and they still don't work, or you want to find the easiest and most effective way to prevent being hassled by this issue again. Then it is time for you to try the best Server file transfer tool – AOMEI Backupper Server now. It can provide you with many powerful and diverse functions:

✐ You can synchronize files from a PC to external hard drives, USB flash drives, NAS devices, or cloud drives and vice versa.
✐ It enables you to set an automatic sync task, and then it will sync the network files daily, weekly, monthly, Event triggers, USB plug in.
✐ There are 4 sync modes supported: Basic Sync, Mirror Sync, Two-Way Sync, and Real-Time Sync.
✐Windows Server operating systems such as 2022/2019/2016/2012/2008/2003, etc. are supported.

Download AOMEI Backupper Server now. Follow the given steps below to share files between servers via AOMEI Backupper.

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Step 1. Launch AOMEI Backupper Server> click Sync and then choose Basic Sync.

File Sync

Step 2. Click Add Folder to browse the computer and select the folders you want to share with other devices.

Add Folder

Step 3. Expand the drop-down menu of the second bar > select Add Share or NAS Devices. Then, type network path and select the shared folder you made before in network location. 

Add Share or NAS Devices

You can click Options to write a comment for the sync task and also enable email notification to tell you the execution result.

☛ Schedule Sync: It allows you to create the scheduled task. You can choose to sync files at daily, weekly, monthly, Event triggers, USB plug in.

Schedule Settings

Step 4. Then, click Start Sync to perform the operation. Thus, Windows Server 2019 slow SMB performance is simply settled.

🔥 Important things:

  • Basic Sync feature only supports one-way sync, that is, modifying, adding, and deleting files on computer A will make the same changes on computer B, but not vice versa.
  • Remember not to rename the source folder after doing the sync. Otherwise, the sync task will fail.
  • You are able to sync files between multiple computers without installing this software again as long as you create a portable version of this software. (Available in technician or technician plus edition).


If the Windows Server 2019 slow file sharing issue troubles you and you have no idea about it. Then you can’t miss this post for I’ve summarized the 3 most effective ways for you to tackle this task without effort. You can modify the system settings to cope with Windows File sharing slow, or you can simply choose to adopt the best file transfer and sharing software so that you will no longer be bothered by such problems hereafter.

As an all-in-one integrated software, AOMEI Backupper combines Backup, Restore, Clone, and other tools to help you manage and protect your data in an efficient way. With its help, it can be a simple and effortless task to implement WD My Cloud Home auto backup PC. So why not try it now?

Miya · Editor
Miya has an excellent insight and receives professional and systematic technical training since joining AOMEI. She has a comprehensive understanding of computer issues, aiming at helping users troubleshoot all kinds of problems. A lot of computer users around the world have found her articles very helpful!