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Compact and efficient Matlab implementations of compliance TopologyOptimization (TO) for 2D and 3D continua are given, consisting of 99 and 125lines respectively. On discretizations ranging from $3\cdot 10^{4}$ to$4.8\cdot10^{5}$ elements, the 2D version, named top99neo, shows speedups from2.55 to 5.5 times compared to the well-known top88 code (Andreassen-etal 2011).The 3D version, named top3D125, is the most compact and efficient Matlabimplementation for 3D TO to date, showing a speedup of 1.9 times compared tothe code of Amir-etal 2014, on a discretization with $2.2\cdot10^{5}$ elements.For both codes, improvements are due to much more efficient procedures for theassembly and implementation of filters and shortcuts in the design update step.The use of an acceleration strategy, yielding major cuts in the overallcomputational time, is also discussed, stressing its easy integration withinthe basic codes.

A new generation 99 line Matlab code for compliance Topology Optimization and its extension to 3D