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Two improvements to the SSE event loop in connectSSE:
1. Read/apply pipelining
The previous loop did read → parse → await applyServerChanges →
read. A slow apply blocked the network reader, so each event
incurred the latency of the previous event's IndexedDB write
before the next chunk could even start streaming in.
Now apply work is enqueued onto a sequential promise chain
(applyChain) and the read loop returns to draining the network
immediately. LWW correctness still requires in-order application,
so the chain serialises applies — the win is just decoupling I/O
from disk work, not parallelism. The chain is awaited once at the
end so the SSE state never resumes from a cursor that hasn't been
written.
2. Allocation-light parser
indexOf/slice replaces split('\n\n') and split('\n'). The previous
parser allocated a fresh array of strings on every chunk; the new
one walks the rolling buffer in place and only materialises the
one event block currently being inspected. Same complexity, less
GC pressure on busy streams.
Drive-by: tightens the JSON.parse error handling to skip malformed
events explicitly instead of swallowing them inside an outer try.
Verified: 20/20 sync.test.ts still passing.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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