Improve freebuff request throughput #658

Job	Run time
build-and-smoke-freebuff-windows	2m 44s
build-freebuff	1m 50s
e2e-slash-commands	1m 35s
e2e-version	1m 28s
e2e-startup	1m 25s
e2e-ads-behavior	1m 45s
e2e-terminal-command	1m 26s
e2e-help-command	1m 34s
e2e-code-edit	1m 36s
e2e-agent-startup	2m 50s
	18m 13s

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