If you want to build your port fast, look at the return on investment (ROI) which is: profit/investment/days.
So consider what the profit potential is for every investment. When you are just starting out, you should be trying for at least 1-2%/day on every investment. This should hold true up to a portfolio of about $50 M or so.
Bonds are the next biggest way to buildup money after openers, and they have much lower risk, so they can be a steadier way to increase your portfolio. Both the-numbers.com and projectgenome.com maintain lists of the calculated adjusts for bonds.
Buy the bonds based on their potential ROI.
Movies adjust on Sunday afternoons, and bond trading for the current weeks adjusts doesn't halt until Mondays. One way to build your portfolio quickly is to sell or cover your opening movie positions on Sunday and make your bond purchases, then sell your bond purchases after they adjust on Tuesday, and buy the next weeks movie openings.
As your portfolio builds, you can buy bonds farther in advance, there is definitely price movement up to a few weeks before the bond adjusts, but never hold a bond that isn't adjusting within a few weeks. And I don't see any advantage in holding a bond after the price has adjusted.
There are other ways to make money quickly - day trading (which involves keeping up with the trade jounals like Variety and trading based on movie news) and playing the dead cat bounce (look it up on Wiki). But if you trade openers and bonds as I suggested, keep an eye on the daily, weekly and monthly leaderboards, because you will be on them.