Qualcomm announced the Snapdragon 8cx at its Snapdragon Technology Summit today, promising to compete with an Intel Core i5. While that should solve some of the obvious performance issues with the older chipsets for Windows 10 PCs, it doesn't solve the other big issue, which is emulated apps.
Indeed, apps like Chrome and Firefox are sluggish, but that's slated to change. Both Firefox and the open-source Chromium will soon run natively on ARM, meaning that there will be a huge boost in performance of the apps. It's been pretty widely reported that Chromium is coming, but now it's confirmed, with Firefox coming as well.