[perf] Improve string encoding performance by ~50% #228
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Entity encoding is a large portion of time spent, since we encode all attribute values and text nodes.
This switches encoding from multiple regular expressions to a linear forward scan.
In the benchmark below, the previous algorithm is the second bar ("replace"), and the new algorithm is the last bar ("scanSegments 2"):
Note: This doesn't show up in our two benchmarks here, because there are no entities present in the text or attributes in those benchmarks.