-T5 = fastest scan (not to be confused with -F (fast scan) as it is fast because it scans for fewer ports.)
Make sure you know the other ones too.
-O = Operating System detection
-A = Aggressive Scan
-T0 = Paranoid Scan (Slowest)
To control the scan activity, Nmap provides the -T option for scanning ranging from high-level to low-level timing aggressiveness. This can be extremely useful for scanning highly filtered networks.
# Nmap -T5 (-T<0-5>: Set timing template (higher is faster)) (P.332/316)
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