How to quickly migrate data from one computer to another

A while ago, I changed my new computer and the old computer was about to be returned. I had collected the data for nearly two years. How can I move the data to the new computer.
First, the company's bandwidth is Mbps.
First, I plan to use the Flying Pigeon to transfer the file. As a result, I uploaded the file on the LAN switch of the company and found that the transfer speed was only about 5 MB. In this way, I had to take it for one afternoon. what's more, the operating system should be installed on the new computer.
The filezilla FTP server is started on the computer, and the filezilla FTP client is used on the new computer to download files from the old computer. At this time, the speed can reach 10-15 Mb/s.
Finally, we found that the speed was not good. We downloaded the small files that were not yet downloaded and compressed them with rar, saving time.
I got my computer at noon and started to install the system at two o'clock P.M.. by nine o'clock, the data on the old machine had not been completely migrated.
In the evening, I went back and tried to connect the two computers with a network cable. The IP address was configured in the same CIDR block. Then I sent the IP address to Feige. The speed reached 20 Mb/s, which was truly surprising.
It is better to use this method to migrate data between computers in the future.