“Slow compilations are really hurting our developers productivity. We are excited by Zapcc potential to accelerate our ScyllaDB build times.”

Avi Kivity
Co-founder/CTO, ScyllaDB


Baptiste Wicht achieved significant gains using Zapcc over GCC and Clang on his Expression Template Library (ETL):

“The result is pretty clear! Zapcc is around three times faster than Clang and around two times faster than GCC. This is pretty impressive!”

Read the full report


David Carlier checked Zapcc and reported roughly 2X compilation speedups for LMMS, the popular professional music production platform and for OpenCV, the extremely popular computer vision library:

“Better, stronger, faster… There is Zapcc”

Read David’s blog


The chair of Applied Mathematics and Numerics at the Department of Mathematics of the TU Dortmund, is developing a C++ Version of the FEAT (Finite Element Analysis Toolbox) package, designed to solve large scale Finite Element based problems in a highly efficient way across a wide variety of modern hardware architectures. FEAT is devised with efficiency, encapsulation and multi-architecture support in mind.

“Using Zapcc, we were able to reduce build times to 1m47s, vs clang 3.8 3m00s, almost a 2X build speedup on a Xeon E5-2670 system.”

Read the case study


“First of all, damn this compiler is fast! I’ve challenged someone at school who still uses default g++, and wouah, I beat him from far. All that to say that Zapcc is an amazing compiler, your team made awesome job!”

Théo B. (happy Zapcc beta II user)


C++ compiler guns for speed records

Developers dread the delays for a C++ project to build, but Zapcc, a variation on the Clang/LLVM compiler, cuts wait times by half or more

“Israeli software outfit Ceemple Software Ltd. recently concluded a round of beta testing for what it hopes to be a major fix for that problem: Zapcc, a compiler that can cut compilation times for many C++ projects by half or more.”

Read more at InfoWorld


“Zapcc Still Aiming For “Super Fast” Compiler Performance”, by Michael Larabel, Phoronix.com


“I tested Zapcc 1.0 against Clang and GCC on couple of Projects. The performance is outstanding, 60% compile time decreasing on average.” 

Xing W.


“I have compiled some of my projects, which have relatively small code base, and the tests resulted in a 10-18x speedup. Also tried in a larger project which resulted in ~2x. Very satisfying results.” 

Bence Gálai, MTA SZTAKI


“I found it easy to integrate with CMake build system to replace Clang and I got 30% instant speed up over Clang 4.0.” 

Csaba Kertész, University of Tampere


mCRL2 now can be compiled using Zapcc 1.0.1, a fast C++ compiler based on clang-5.0. This speeds up the compilation with about 40%.” 

Wieger Wesselink, Eindhoven University of Technology


“This compiler just blew my mind. It’s really fast. This compiler just doesn’t stop to surprise me.” 

Muhammad Falak R Wani, Masters Student – Compiler/Runtimes


“I was very impressed with the performance of Zapcc. Normally, it took about 8 minutes to compile our C++ project with GCC, but with Zapcc, it took only 50 seconds.” 

Nguyen Tran, Post-doc Researcher, Oxford University