50 Gb Test File <Original ✓>

iPerf3 is great, but it uses pure memory-to-memory traffic. A 50GB file forces the OS disk stack to participate.

Checking upload and download speeds to services like AWS S3 or Azure. 50 gb test file

For random data (simulates incompressible files like video): iPerf3 is great, but it uses pure memory-to-memory traffic

The dd command is the fastest, most reliable tool. iPerf3 is great

Instead of copying real data, you can generate a sparse or dummy file almost instantly. This avoids wearing out SSDs with unnecessary writes.

dd if=/dev/urandom of=testfile.dat bs=1M count=51200 status=progress