@Cammy
The Amiga 1200 is a 32-bit computer, so installing a 16-bit SRAM PCMCIA card will have an adverse effect on system performance.
It is better to use a trapdoor expansion / accelerator which is 32-bit especially as many WHDLoad Slaves require higher performance than a stock A1200 can provide. A good example is Chaos Engine AGA (WHDLoad) which unfortunately is very laggy on a vanilla A1200.
However, your advice would be valid for an unaccelerated A600 as this is a 16-bit system.