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Answer : You have 1333 DDR (Double Data Rate) RAM. The RAM itself runs at 666MHz, but because it is "double pumped" its equivalent data rate is twice that, hence 1333MHz. You do indeed have PC3-10600. CPU-Z shows only the half of it because DDR RAM like the names says - Double Data Rate - can transfer twice as much data on one I/O bus clock, than the actual IO frequency which CPUZ shows. If you want to dig deeper in this topic check this link, it describes it really well. Actually its not 10600 but 10700 as the OP says. and it runs at 1334 (2x667) to be exact. Sisoft Sandra measures the same as the description.

Answer : The emulator is just slow, there is not much you can do about it. See https://stackoverflow.com/questions/1554099/slow-android-emulator To maximize the accuracy between emulator and real devices, Google emulator uses ARM opcode, a kind of machine language. It must convert from ARM opcode to Intel opcode. That's why it's slow. My computer is 3GB RAM but it's still slow and lagged. The problem seems not to be RAM but CPU. Improving CPU will improve the emulator. To use emulator more effectively, this is my experience: Don't close emulator everytime you run your application. Scale the emulator screen smaller. Disable snapshot (Yes, it's useful but it takes time to close the emulator). Specify a file path for SD card image file. I use only one SD card for many AVDs. If you got any problems in adb, just reset adb, don't close emulator. Open few programs in your operating sytem. If you are using Windows, don't ever close emulator. Do it c...

Answer : It works if you create a JHFS+ volume first and convert it to APFS in a second step: DISK_ID=$(hdiutil attach -nomount ram://$((<number_of_blocks>))) diskutil eraseDisk JHFS+ "RAM Disk" $DISK_ID diskutil apfs convert $(tr -d ' '<<<${DISK_ID}s2) If the RAM disk has a size of 2 GiB (4 * 1024 * 1024)(block_size) or smaller no EFI partition is created and the 3rd command is: diskutil apfs convert $(tr -d ' '<<<${DISK_ID}s1) or more generally: DISK_ID=$(hdiutil attach -nomount ram://$((<number_of_blocks>))) SIZE=$(diskutil info $DISK_ID | awk -F'[^0-9]*' '/Disk Size/ {print$4}') diskutil eraseDisk JHFS+ "RAM Disk" $DISK_ID if [ $SIZE -le 2147483648 ]; then diskutil apfs convert $(tr -d ' '<<<${DISK_ID}s1); else diskutil apfs convert $(tr -d ' '<<<${DISK_ID}s2); fi Result: ... /dev/disk2 (disk image): #: TYPE NAME SIZE ...