There is no feature in the Modula language which makes it compilation fundamentally slower than the compilation of Pascal. Actually, Turbo Pascal later retrofit

There is no feature in the Modula language which makes it compilation fundamentally slower than the compilation of Pascal. Actually, Turbo Pascal later retrofitted the main Modula feature - seperate compilation of modules - onto the Pascal language in the form of units. The observed differences in the compile times should come from implementation differences of the compilers - the fact that the Modula compiler took longer to run but produced the faster executable hints towards the Modula compiler spending its time on code optimization.