In my opinion, this is the single most important requisite for reading. Use a dictionary to look up any words you don't know. If you don't understand a key term or two, the work quickly becomes incomprehensible. Unfortunately, the only way to acquire a decent vocabulary is by reading. However, reading alone will not help.
It may be quite a learning curve at the get-go, but soon you won't need to use the darned thing at all, especially as words start to acquire meaning through context.
Sign up for a speed-reading course or seminar ' many are available. Pare down your office reading to include only the most essential items. For example, try assigning subordinates to sift through material and mark only what is relevant so that you have a reduced reading list.