is the + operator less performant than StringBuffer.append()

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Your example is not a good one in that it is very unlikely that the performance will be signficantly different. In your example readability should trump performance because the performance gain of one vs the other is negligable. The benefits of an array (StringBuffer) are only apparent when you are doing many concatentations. Even then your mileage can very depending on your browser.

Here is a detailed performance analysis that shows performance using all the different JavaScript concatenation methods across many different browsers; String Performance an Analysis

join() once, concat() once, join() for, += for, concat() for

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Ajaxian >> String Performance in IE: Array.join vs += continued

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