HDDs are downright slugs. As to 100MB, that's the compressed image and not the fully expanded image Photoshop works with in RAM.
SSD is first then RAM.
Ok, so i have 2 laptop. The first laptop is macbook pro mid 2012. I swap the HDD with 256GB SSD and 8GB RAM. I do photoshopping almost with no lag.
My latest laptop is ASUS A409FJ. I bought it yesterday with spec core i5, 8GB Ram and 1TB HDD. But i experience some lag when doing some basic photoshop task (e.g selecting layer, resizing etc). The file itself is only arround 100MB. When i check task manager, the memory is filled almost 80%.
My question is, .. what cause this lag? The RAM or the HDD? if i swap the HDD with an SSD, will it eliminate the problem?