Xcode costs high cpu usage when switch to new build system

I find legacy build system will be deprecated. But when I switch to new build system and run, xcode just stuck. Cpu cost mount to 100% and even higher. Any one has idea how to solve this?

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I find legacy build system will be deprecated. But when I switch to new build system and run, xcode just stuck. Cpu cost mount to 100% and even higher. Any one has idea how to solve this?

Did you solve it?