O(N^2) can cause slowdown very fast. 1000^2 is a million operations. 10000^2 is 100 million operations. If each operation is 100 instructions, that's 10Ghz v

O(N^2) can cause slowdown very fast. 1000^2 is a million operations. 10000^2 is 100 million operations. If each operation is 100 instructions, that's 10Ghz very roughly. That would cause pauses even with a modern CPU.