Hello Tuomas, I think the compilation time can be speeded up by disabling COFFEE, and possibly the host compiler (GCC) optimisations. For the former, you can use the parameter dictionary, for the latter, you might need to edit a line in PyOP2. I cannot say for sure, but I expect this could about halve the compilation time. The execution time (assembly time) will probably be a lot worse. Cheers, Miklos ________________________________________ From: firedrake-bounces@imperial.ac.uk [firedrake-bounces@imperial.ac.uk] on behalf of Tuomas Karna [tuomas.karna@gmail.com] Sent: 16 September 2015 22:42 To: firedrake Subject: [firedrake] Slow compilation with fd_bendy Hello Firedrakers, I'm using "fd_bendy" branches of FFC and UFL, and it takes ~15 min to compile the attached example (with master branches it takes only ~1 min). Is there any way to speed it up? Are there some optimization flags I can turn off? I'm running small test cases so runtime efficiency is not a concern. Cheers, Tuomas