System lags

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When i copy a file into USB larger tham 1GB my system lags. What can i do??

What are your hardware specs? Are you using usb 2, 3, type C? It may just be that it puts a load on your hardware when you move something of that size to a usb drive. What file manager are you using? What desktop environment? Are you using LTS or current kernel?

<some elaboration may be required>

~thank you ^_^