RyuJIT is a next-generation JIT compiler that is a complete rewrite of the Just In Time (JIT) compiler and generates a lot more efficient native machine code. It is twice as fast as the previous 64-bit compiler and provides 30% faster compilation. Initially, it runs on only X64 architectures, but now it supports X86 as well and developers can use the RyuJIT compiler for both X64 and X86. .NET Core 2.0 uses RyuJIT for both X86 and X64 platforms.