Methods for improving an implementation of a design in a programmable logic device (PLD). A topological level of the design implementation is determined for each look-up table (LUT) of the PLD. A subset of the LUTs that are on the critical timing paths of the design implementation is determined. For each LUT in the subset at each topological level, a set combinations is determined for assigning signals to the inputs of the LUT. A current assignment of the signals to the LUT inputs is initialized according to the design implementation. For each LUT in the subset at each topological level, the method determines whether a respective assignment for each combination in the set for the LUT improves a timing metric for the LUT relative to the current assignment for the LUT, and the current assignment is updated when the respective assignment improves the timing metric for the LUT.

 
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