The project is open source, it's relatively easy to compile your own executable and wrapper. Enigma source can be found at http://www.bytereef.org and the wrapper is BOINC default one (it comes with BOINC sources inside boinc/samples); wrapper has no effect on speed so you can use the default one or one of my upgraded wrappers with working progress indicator to run your app. Executable built for specific system/hardware usually is much faster (from 15-20% up, in some cases custom build app can be twice as fast) than the default one, so if you feel you can do it, try it.

Linux: I've tried compiling enigma-suite with gcc versions from 3.2 up to the latest, 3.2 was the fastest one when I used only safe cflags for specific processors, however latest gcc can be faster if you add more cflags for advanced optimizations. If you have Intel processor, Intel C/C++ compiler is recommended. It's free for personal use and the results are impressive - optimized executable can be up to twice as fast as the default app.

Windows: It's relatively easy to compile enigma with dev-cpp (just create an empty windows console app c project and add all source files), then you can play with compiler options. It's also possible to replace the compiler included in dev-cpp package with newer MinGW 5.1.x which gives some minor speed improvements - I've done that by replacing all compiler binaries.
Building enigma suite with Visual Studio and/or Visual C++ is a bit harder, because you'll have to add additional header files to add support for getopt.



As alternative, you can try one of these precompiled executables:

Please use it only if you know what you are doing. It's very easy to trash large numbers of workunits if you do something wrong.

Average speed increase is at about 15-20%, in some cases up to 30%.

How to switch app
download two archives:

Windows:

Last update: 19.02.2013
http://dl.getdropbox.com/u/1912652/c2d.zip - a newer version of app_info.xml, contains only the new app (the old one is unused). The enigma executable packed in this archive is an Intel C2D executable for Win32 (runs also on x64), if you want to run it on other processor, replace the executable with other from the archive below:

https://dl.dropbox.com/u/1912652/exe.zip - pack of recompiled executables, use one from this archive if the c2d version does not work for you.
http://dl.getdropbox.com/u/1912652/enigma_076_windows_intelx86.exe - executable for Intel Atom.

My old Windows benchmark http://dl.getdropbox.com/u/1912652/win_bench.7z

It uses compiled AutoIt script to run and control enigma executable; there's no progress or GUI, only AutoIt tray icon while it's running. When finished, it shows the CPU time (in seconds) in a small window.
How to use: replace the enigma.exe with the executable you want to test and click benchmark.exe


Linux:

Last update: 18.02.2013
https://dl.dropbox.com/u/1912652/app_test_522.tgz - app xml with all files
https://dl.dropbox.com/u/1912652/enigma_athlon64_64bit.tgz - 64bit executable for Athlon 64/Athlon 64 X2.
http://tjm.boo.pl/enigma/test.tgz - pack of execs compiled with gcc 3.2

Linux users: it's very easy to compile your own executable, either with gcc or Intel C/C++ compiler (which is free for personal use). Read posts below.

How to switch app:

Shutdown BOINC, open first archive and replace files in project folder:



then open second archive, pick one executable, and replace the old one in project folder.





When you start BOINC again, it should resume previous tasks with new app.
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Edit2:
finished some tasks, speedup around 5-18% on a C2D. Validation ok.
Restart with Boinc from zero took only the half time, so checkpointing is working but the time is not running from the last end point.

<user_friendly_name>Enigma 0.76 5.17</user_friendly_name>

It goes right underneath the line near the beginning of the file that says:

<name>enigma_m4_naval_2</name>

41% faster on my Athlon 64 X2!

Nope, optimized app cannot be installed as default, because it doesn't work on all systems/hardware configurations.

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It's application optimization, not the BOINC client, so it has no effects on other projects.
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Then I'd have to run 5 test apps (for Athlon 64, Athlon TB/Athlon XP, C2D, PIV/Celeron D, Coppermine/Tualatin), unless there's an option to replace executables on client side. If a test app requires it's own validator, then it would be even worse, because running 6 validators (or 12 if I add another app) is a waste of server resources.
Btw these apps are not really optimized, just compiled with different -march settings. It's not the best way to optimize apps, but the speed increase is significant (usually between 15 and 40%, depends on processor).

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M4 Project wiki