Both comparisons will be compiled to machine instructions like BLT (branch on less than) or BLE (branch on less equal), which check some status bits like BLT: N-V + -NV (negative & not overflow or not negative and overflow) or BLE: Z + N-V + -NV (zero or negative & not overflow or not negative and overflow).
These instruction take normally exactly the same time, so they are equally fast.
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solved What will be faster, >= or >? [duplicate]