Known issue | Stuttering

Open the performancefix.reg with an editor (e.g. Adjust the path to your game installation location (e.g. C:GOG GamesJagged Alliance 2). Save the adjusted performancefix.reg. Execute the adjusted performancefix.reg and confirm the displayed prompts. If this doesn't lead to solving the stuttering, continue with the following steps. Jagged Alliance: Back in Action Trainer, Saves, Editor for PC. Best archive of Jagged Alliance: Back in Action trainer, saves and editor, action replay codes, solutions. Jagged Alliance: Back in Action Trainer, Saves, Editor. (1.13) RETAIL/STEAM VERSION OF THE GAME. May not work with all versions. Read the included readme file with Notepad.

Even though 1.13 revamps many aspects of Jagged Alliance 2, the game itself has a few years under its belt and therefore various issues can occur.
For newer operating systems (≥ Microsoft Windows 8) the most frequently appearing problem is consistent stuttering.
Should you encounter this issue, follow these steps:

Download the performancefix.zip here.
Unzip the downloaded performancefix.zip.
Open the performancefix.reg with an editor (e.g. Notepad).
Adjust the path to your game installation location (e.g. C:GOG GamesJagged Alliance 2).
Save the adjusted performancefix.reg.
Execute the adjusted performancefix.reg and confirm the displayed prompts.

If this doesn't lead to solving the stuttering, continue with the following steps.

Download the dllfix.zip here.
Unzip the downloaded dllfix.zip.
Copy all files of the unzipped dllfix.zip into the main installation folder of Jagged Alliance 2 (e.g. C:GOG GamesJagged Alliance 2).

Most of the stuttering issues can be solved through these two fixes.

Ja2 Save Game Editor Download

Should you encounter further problems, feel free to take a look at the Technical Issues with JA2 1.13 - Problems and Solutions.txt within the Docs folder of your Jagged Alliance 2 installation location (e.g. C:GOG GamesJagged Alliance 2Docs) or directly turn to the community at The Bear's Pit.