[nightowl_games]

Quantum computing only solves certain classes of tasks faster, not all tasks, not most tasks, only a tiny amount of tasks.

[zeroonetwothree]

Actually, Grover’s algorithm would speed up a wide range of tasks. Hardly a tiny amount.

[tsimionescu]

Only marginally, and it's going to take a loooooooong time until you'll have a quantum computer the size of today's classical computers to actually see any improvement from Grover's algorithm.

Shor's is a completely different matter entirely: the difference between exponential and linear time is so huge that even a comparatively tiny QC (only a few million qubits) would significantly outpace the largest classical supercomputers put together on this specific problem.