Is there any side effect for using the 30 fps fix?

Which fix is that???

Can you send more details?

Taken from: http://www.guru3d.com/articles_pages/dragon_age_inquisition_vga_graphics_performance_benchmark_review,9.html

If you are having problems with stuttering in Dragon Age 3, the problem stems from the cut-scenes being locked at 30 frames per second, and it seems like they are desyncing and causing all sorts of strange issues. BioWare is intending to release a fix that removes the 30 frames per second cap in Dragon Age 3: Inquisition, but until then here’s a simple workaround. First things first, you’re going to want to do this fix after character creation, because for some reason doing it before can make your character spawn in a fiery abyss with no means of escape. Once that’s done exit out and close down Dragon Age: Inquisition. Find the install file which is typically located at “Local Disc / Program Files (x86) / Origin Games / Dragon Age Inquisition”, right-click the main executable and click “Send To > Desktop (Create Shortcut)”. Head to your desktop and find the Dragon Age Inquisition executable, wherever it’s lurking. Right-click on it and select 'Properties'. In the new window that appears select the 'Target Directory' box and add the following to the end of what is already in there -

-GameTime.MaxSimFps 60 -GameTime.ForceSimRate 60+

Save it and launch and it should all be fixed now, pushing the frame rate in Dragon Age: Inquisition up from 30 to 60 frames per second. The Dragon Age: Inquisition 30fps fix can cause issues with multiplayer. To avoid any issues, when running single-player used the modified shortcut created using the method above. When playing multiplayer, launch Dragon Age 3 through the Origin client and play as normal without the modified command line. In addition it's also always worth right-clicking Dragon Age: Inquisition in your Origin library and selecting "Game Properties" and checking the box for disabling Origin in-game, which can give a vital bump to your frame rate (props to game-dbate for this fix).

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@Krelianz wrote:

I know i have to create the character before using it and i know it breaks the multiplayer, other than those 2 problems is there any other problem if i use it?

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Those are the only known problems. It's impossible to know how it affects the game in a broad scope until more testing has been done, but it's been recommended by BioWare that you do not alter the command line in any way.

Yes... there are several very good cutscenes that will be entirely ruined if you use that "fix". I noticed the problem during the rather awesome cutscene at the end of act one... all of the dialog was completely out of sync which was a huge bummer because that was a moving scene. I got a few minutes in and force-closed the game and re-loaded without this "tweak" disabled and I haven't looked back

I've heard that it can cause problems loading in and out of some cutscenes as well and it causes some major issues with multipler (latency/rubberbanding).