スペクター対策で遅くなってるWindows10、うまく行けば来年春の大型アップデートで少しは元に戻るかも。

Next Windows 10 feature update to make your PC faster following Spectre slowdowns

https://www.neowin.net/news/next-windows-10-feature-update-to-make-your-pc-faster-following-spectre-slowdowns/