Eirik Bjørsnøs has pointed out that lookup time of versioned entries in multi-release jar files will increase the more releases we go since 8, and has suggested a number of ways in which we can improve this. Mainly by calculating the versions for which there actually are any entries.

See thread on core-libs-dev for more discussions and patches: https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-April/065764.html