The A1 symbol on Micro-SD cards tell you if it is fast enough for apps - NotebookCheck.net News
Micro Center Premium 64GB microSDXC Card UHS-I Flash Memory Card C10 U3 V30 A1 Micro SD Card with Adapter - 2 Pack - Micro Center
Are high-speed/high-capacity (A1, A2, U3) microSD cards worth it for Android? With Black Friday and Cyber Monday deals coming up, I (re)tested 5 of those and 2 older ones in 3 quite