Hi, We are working on a Finite Element Library (FELyX - http://felyx.sourceforge.net http://felyx.sourceforge.net/ ) that makes intensive use of the Boost Graph Library (BGL) as well as the Matrix Template Library (MTL). Up to now we worked with gcc 2.95.3 on Linux (AMD XP2000+ and P4 2.2GHz). Due to several sources on the internet we heard, that gcc 3.1.1 should be at least as fast as gcc 2.95.3 and the Intel c++ 6.0 should be even quite a bit faster then the other two. We used with all three of them -O3 Optimization, but our results up to now are rather disappointing. For a typical calculation we received the following results: Gcc 2.95.3 3.5 sec Gcc 3.1.1 3.9 sec Intel C++ 6.0 8.2 sec The results were quasi identical on both machines. We also tried a Intel PIII 850MHz in a notebook, and the times just scaled up. Further we looked at BGL, MTL and our own code separately and it came out that every part of the code loses almost equally compared to 2.95.3. Has anybody similar experiences or a hint what we could do wrong? Yours truly, Marc Wintermantel Marc Wintermantel IMES - Structures Technology ETH Zurich, LEO C4 Leonhardstrasse 27 CH- 8092 Zurich Tel. ++41 1 633 35 32 Fax. ++41 1 632 17 02 [Non-text portions of this message have been removed]