If Time Machine is slow on Mac
Try these suggestions if Time Machine is slow on your Mac.
The first time you use Time Machine, set it up in the evening so that the initial backup can be done overnight.
If your backup disk is a Time Capsule, leave your Mac in the same room as the Time Capsule for the initial backup, or use an Ethernet cable to connect your Mac to one of the Ethernet ports on the Time Capsule.
Virus scanning software can make Time Machine backups very slow. If you use Norton AntiVirus or a similar product, try to exclude your backup disk from automatic scanning. Also make sure you are running the latest version of the virus scanning software.
If your backup disk is a USB disk, or a USB disk attached to a NAS device, ensure the disk supports USB 3 and is connected to a USB 3 port on your device.
Time Machine is designed so that it doesn’t interfere with the regular operation of your computer. If your Mac is busy, hot, or the battery is running low (Mac notebook computers only), Time Machine slows until your Mac is idle, cool, or charged.