docs: more redis improvements (#453)

Author: metachris

docs/docs/20230602-recent-performance-improvements.md

@@ -2,6 +2,8 @@
 
 2023-06-02, by [@metachris](https://twitter.com/metachris)
 
+See also [part 2 of the performance improvements documentation](20230605-more-redis-performance-improvements.md).
+
 ---
 
 There have been a number of significant performance improvements in the mev-boost-relay codebase recently, and I wanted to shine some light on them and add more details and context about the nature of the changes as well as about the impact.

docs/docs/20230605-more-redis-performance-improvements.md

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+# More Redis performance improvements in the mev-boost-relay codebase
+
+2023-06-05, by [@metachris](https://twitter.com/metachris)
+
+See also [part 1 of the performance improvements documentation](20230602-recent-performance-improvements.md).
+
+---
+
+There have been a few additional significant Redis performance improvements that are worth highlighting:
+
+- [More Redis pipelining for block submissions - PR #447](https://github.com/flashbots/mev-boost-relay/pull/447)
+- [Redis: save ExecPayload in SSZ format - PR #448](https://github.com/flashbots/mev-boost-relay/pull/448)
+
+_Shoutout to Benjamin Hunter from Bloxroute who first shared the Redis improvements in [mev-relay#3](https://github.com/bloXroute-Labs/mev-relay/pull/3)._
+
+These changes significantly reduce Redis load, which the following screenshots show in detail:
+
+![Redis stats 3](../images/redis-stats-3.png)
+![Redis stats 4](../images/redis-stats-4.png)
+![Redis stats 5](../images/redis-stats-5.png)
+![Redis stats 7](../images/redis-stats-7.png)
+![Redis stats 8](../images/redis-stats-8.png)
+
+Additionally, there's a big impact to the performance of fast-tracked submissions in this PR:
+
+- [Don't fast-track large block submissions - PR #451](https://github.com/flashbots/mev-boost-relay/pull/451)
+
+Impact on overall fast-track request duration:
+
+![Request duration 2](../images/request-duration-2.png)
+![Request duration 3](../images/request-duration-3.png)