Usually I would go to the forums to dig for this answer but I only have my phone not computer right now. Will my Sandisk 32 GB SD 45 MB's effect my speed of the CF card Sandisk 32GB EXTREME PRO CF CARD 160MB/S? Also can I transfer my Magic Lantern from the SD to CF with in the 5D Mark III. I only have a SD reader not a CF reader. :-\
No.
No. And you don't need to because you can run ML from SD and write to CF.
But get a decent cardreader anyway. You will get into troubles transfering large MLV files to your computer without it.
http://www.cameramemoryspeed.com/reviews/card-readers/
@Silverscorpion -- Kingston FCR-HS4 (https://www.bhphotovideo.com/bnh/controller/home?O=&sku=1140474&gclid=Cj0KEQiAnvfDBRCXrabLl6-6t-0BEiQAW4SRUBql7IHF8Qwb4dWRbghExi7p38V9Xq8q6U58PqTJuHMaAlBC8P8HAQ&is=REG&ap=y&m=Y&c3api=1876%2C92051677562%2C&A=details&Q=Kingston%20FCR-HS4) works well.