Following the discovery of the Meltdown and Spectre vulnerabilities in Intel processors, the resulting fixes for the issue slowed down many PCs. The next feature update to Windows 10 may change that.
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After Microsoft recently announced that it would be resetting the Skip Ahead subset of the Fast ring, the company has now reopened it for anyone that for anyone that wants to start testing 19H1.
When Microsoft announced Windows 10 build 17713 today, it said that it will be resetting Skip Ahead for the next Windows 10 development cycle, which means that you'll have to re-enroll in the ring.