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At the moment yes it does conflict a little yes.
Cloudflare’s SpeedBrain product only allows cached responses to be speculated when it is enabled. This was a safety check they put in to prevent overloading origin servers or speculating unsafe pages since they enabled it by default.
This means you might see less speculations as uncached responses (arguably the ones that benefit the most from this!) will be blocked.
However, for cached responses it will work the same. So they are compatible in that sense.
We recommend disabling SpeedBrain if you have an explicit, better, set of rules enabled at a site level. Like this plugin does for you.