Ah! Almost forgot!
Uint8Array.fromBase64/toBase64 has been promoted to Stage 4, therefore I have implemented it in Self-hosted LiveSync via octagonal-wheels!
Compared to previous implementations, it shows about 10x faster benchmark performance, and I think it seems that the likelihood of being caught by watchdog or OOM errors has decreased significantly.
https://github.com/tc39/proposals/blob/main/finished-proposals.md
Now available; Self-hosted LiveSync v0.25.19!
https://github.com/vrtmrz/obsidian-livesync/releases/tag/0.25.19