Are you having trouble when Filezilla is slow while uploading or downloading files? By default, the FTP transfer speed between the client and the server depends on many factors: Internet Service Provider limits, FTP server, client settings, etc. In such situation, user can only control the settings of its FTP client. By default, the FTP Client Filezilla is installed with minimal settings that limit the maximum allowed connection speed to the FTP server. But if you change a few things you can speed up Filezilla and increase your download speed by over 2Mb/s.
Speed up FileZilla Instructions
Step 1: Install FileZilla
Download and install the FileZilla FTP client from the official website;
Run FileZilla and create a new connection to the FTP host you are connecting with (File > Site Manager >New Site). Specify the FTP server (host) name and credentials to connect to it (or use Anonymous logon type);
Step 3: Speed Up FileZilla FTP Transfer by Limiting Connections
Go over to the Transfer Settings tab and check Limit Simultaneous connections option. Then input 10 for the Maximum Number of Connections (by default FileZilla use only two simultaneous connections). This way you will allow the FTP client to download or upload simultaneously 10 files in parallel threads, which significantly speeds up the overall speed when transferring multiple files.
This will optimize your connection speed with most of the servers speed to get the highest one and without the need in a disconnecting (during our tests download speed jumped from 900KB down to 2500KB down just from changing this single option).
Step 4: Switch to Up FTP Passive Mode
Also, check that Passive transfer mode is selected. This is the recommended mode for client computers behind NAT or proxy. In case you have a direct internet connection and dedicated IP address, you can try to switch to Active FTP transfer mode.
Note. The main difference between the active FTP mode and the passive FTP mode is the side that opens the data connection. In the active mode, the client must accept connection from the FTP server. In passive mode, the client always initiates the connection.
If you want to change default FileZilla behavior for a new FTP connection, go to the top menu Edit > Settings > Transfers. Under Concurrent Transfer section, change Maximum Simultaneous Transfers to 10.
In addition, to speed up Filezilla, you can try to run a second instance of the program, which will also transfer files in 10 concurrent sessions.
Filezilla Downloading Speed Remains Slow?
If the steps described above didn’t help you and that doesn’t increase the speed, most likely you set a limit on your ISP (ask your ISP how many simultaneous connections the server supports); or on the webserver you are connecting to (if you use Filezilla FTP Server, increase the values of Internal transfer buffer size and the Socket buffer size. We have experienced hosts like GoDaddy tightly restricting their speeds on FTP.