SkyDream:
Thanks.
First load of that
pdf took about 24sec. (notification 'file too large' was also shown)
Later it took about 5 sec. to open.
After 'Clear mark' it took again 24sec.
There is no difference in microSD / device location.
(reported time = time between pressing OK button and showing first page)
EricLandes:
microSD - contacts (golden wires) up, push until it is completely inside (invisible from side view).