Basic HTML version of Foils prepared April 4 1999

Foil 22 JavaScript Performance Issues

From The Document Object Model - Universal Access - Other Objects - CORBA XML Jini JavaScript etc. Tango Seminar to DoD Modernization MSRC -- April 6 1999. by Geoffrey C. Fox


1 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)
2 A Java interpreter is roughly 50 times slower than C
3 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
4 Perl is 500 times slower than C (an interpreter but analyses whole code before interpreting)
  • Runtime (e.g. I/O) can be as fast as C as it is C!
5 Tcl, JavaScript (true interpreters) are up to 5000 times slower than C
  • BUT If Java Script in browser invokes optimized C++ internal function, it can easily outperform Java
  • Just as Java itself can of course invoke through JNI C++ code.
  • Need C++ library to be built in as do not want to download

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