They are the notable exception, yes. Note that aside from V8, all have multiple JITs (and V8 is gaining a mid-tier compiler, so they can move away from the inte

They are the notable exception, yes. Note that aside from V8, all have multiple JITs (and V8 is gaining a mid-tier compiler, so they can move away from the interpreter sooner), which adds a fair amount of extra complexity and maintenance cost. All have pretty advanced interpreters, which also helps make warmup smoother.