The Transformer Book T100T features an Intel Atom Z3740 processor which is clocked at 1.33 GHz, although this can be boosted to around 1.8 GHz in Turbo Mode. This is a quad core model, which suggests that this tablet will offer decent multi-tasking performance. In addition, the T100T features 2 GB of DDR3 RAM which is clocked at 1066 MHz.
The T100T delivers solid performance for a tablet, although it is significantly slower than most full-size Windows 8.1 notebooks. Still, it has enough power to complete basic tasks such as word processing and multimedia playback, so it should more than suffice for most users.
There IS a micro-SD slot, just above the micro-USB connector. And as I have this tablet, I can confirm that it works well with 64g micro sdxc card without issues.