For its part, the V8 team has released version 5.4, a new branch of the engine. "V8 5.4 delivers a number of key improvements in memory footprint and startup speed," the team said in a bulletin. "These primarily help accelerate initial script execution and reduce page load in Chrome."
The 5.4 branch will be in a beta phase of development until it is released along with the Chrome 54 Stable browser in a few weeks.
Meanwhile, developers at the Institute for System Programming of the Russian Academy of Sciences have forked from V8 an experimental compiler, LLV8, for producing highly optimized code. LLV8 uses the LLVM compiler project's MCJIT execution engine. "LLV8 (back end) is implemented as a patch to V8 and it cannot function without the virtual machine," according to the project's GitHub repo. "Although LLV8 is only a fraction of the entire patched VM, we also refer to the whole thing (our fork of V8) as LLV8." The code base is in two repositories, LLVM fork and V8 fork.