(note: this is a temporary file, to be added-to by anybody, and moved to release-notes at release time)

Notable changes

Node Performance Improvements

This release makes several changes to improve the performance of node operations. These include:

Backported CuckooCache from upstream to improve the performance of signature caching.
Added caching of proof and signature validation results for Sapling and Orchard to eliminate redundant computation.
Backported SHA-256 assembly optimizations from upstream.

This release makes several changes to improve the performance of wallet operations. These include:

We now parallelize and batch trial decryption of Sapling outputs.
We now prune witness data in the wallet for notes spent more than 100 blocks in the past, so that we can avoid unnecessarily updating those witnesses. In order to take advantage of this performance improvement, users will need to start their nodes with -rescan one time, in order to ensure that witnesses for spent notes are in the wallet are properly pruned.
The process for incrementing the witnesses for notes the wallet is tracking has been optimized to avoid redundant passes over the wallet.
Removed an assertion that was causing a slowdown in wallet scanning post-NU5.

A version field was added to the result for the gettransaction RPC call to avoid the need to make an extra call to getrawtransaction just to retrieve the version.

Fixed a regression that caused an incorrect process name to appear in the process list.