The current linux builds still have tcmalloc on by default, this causes a few issues for people using the prebuild from cefbuilds.com/forcing them to build their own versions.
1) If someone uses dlopen or friends, this will often lead to crashes or memory corruption. https://github.com/cztomczak/cefpython/issues/155 https://github.com/cztomczak/cefpython/issues/73 and likely more
2) Performance benefits seem marginal http://www.magpcss.org/ceforum/viewtopic.php?f=10&t=11462 (granted this is a bit old)
3) If someone would like something as intrusive as tcmalloc in their application, it should be the main executable that dictates this, not some so/dll/dylib that gets loaded.
4) This goes along with 3, even if there would be a strong need for tcmalloc, it's quite bad to leak an implementation detail like it and bleed it over the whole process, rather than at least keeping it local to just the loaded module