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...that you lose precision in gcc3. To illustrate the impact, changing "long double" to "double" in gcc4 will bring the 250kx1k test down from 7.7s to 2.1s which is almost the same as gcc3. Thus, restricting R to double computations I get for the 37x37 test with gcc 4.0.3: gcc4nld: 0.7s which is actually even faster than the gcc3 result. Attached you will find the R benchmarks 2.3 results (ran with R 2.4.0) - there is pretty much no difference between the binaries except for the 37x37 test and the explanation is above. Cheers, Simon -------------- next part ---------...