[jdk17u-dev] RFR: 8309527: Improve test proxy performance [v2]

[Goetz Lindenmaier]

> I backport this for parity with 17.0.12-oracle.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into backport-GoeLin-fadcd650
 - Backport fadcd6501879af40360b217d2f76ab86a6f55d27

-------------

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/2388/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/2388/files/e0473649..32a80190

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2388&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2388&range=00-01

  Stats: 299 lines in 13 files changed: 0 ins; 299 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2388.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2388/head:pull/2388

PR: https://git.openjdk.org/jdk17u-dev/pull/2388