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Typically, up to 106 C instructions may be executed in a few milliseconds (the time it takes a person to notice anything!) as one instruction in 1 clock cycle (say 108/sec)
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A Java interpreter is roughly 50 times slower than C
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Java "Just-In-Time" compiler is roughly 2–8 times slower than C whereas a native Java Compiler (and perhaps future JIT's) are about same speed as C
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Perl is 500 times slower than C (an interpreter but analyses whole code before interpreting)
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Runtime (e.g. I/O) can be as fast as C as it is C!
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Tcl, JavaScript (true interpreters) are up to 5000 times slower than C
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BUT If Java Script in browser invokes optimized C++ internal function, it can easily outperform Java
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Just as Java itself can of course invoke through JNI C++ code.
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Need C++ library to be built in as do not want to download
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