improve performance of json formatter #35501
Description
Title: improve performance of json formatter
Description:
See the performance result:
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Benchmark Time CPU Iterations
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BM_AccessLogFormatterSetup 8899 ns 8851 ns 78731
BM_AccessLogFormatter 486 ns 485 ns 1452972
BM_StructAccessLogFormatter 7433 ns 7423 ns 92404
BM_TypedStructAccessLogFormatter 5459 ns 5394 ns 124266
BM_JsonAccessLogFormatter 12378 ns 12364 ns 52029
BM_TypedJsonAccessLogFormatter 11297 ns 11282 ns 65591
BM_FormatterCommandParsing 40.5 ns 40.5 ns 17290397
The json formatter takes 20+x overhead rather than text formatter. What can I say? I always know it is slow, but I don't know it's so slow.
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