Generally. Java 5 or Java 6 was pre-installed on Mac OS X prior to 10.6 , but this ceased at 10.7.
In addition, a recent Mac OSX update removes a version of the Java 6 plugin previously supported by Apple. Apple has never supported Java 7.
https://blogs.oracle.com/thejavatutorials/entry/apple_s_java_mac_os
You (or your users) need to download and install Java 7 for Mac from Oracle. But a comment by @Andrew Thompson (see above) offers a good way to smooth out this “speed hit."
Stephen c
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