It sounds like Origin may not be working correctly. So you might try clearing Origin cache.
- How To: Clear Origin Cache
https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/If that doesn't help try manually uninstalling and reinstalling Origin.
Try uninstalling/reinstalling Origin.
https://help.ea.com/en-us/help/origin/origin/manually-uninstalling-origin/To turn off Origin In-Game
Open Origin, Select Origin > Application Settings > Origin In Game tab and click the on/off switch to disable Origin In Game. - This deactivates Origin In-Game, as it has been known to cause problems with games.
I am not real familiar with combining packages. Something to try instead is take out what you have and add only a few at a time. As if to troubleshoot the lag issue.
To fix mods and custom content try the 50/50 method:
1. Move all the mods and cc out into a temporary folder on the desktop.
2. Move a few custom content files back at a time. Load the game to make sure it loads and everything is good.
3. Delete the game cache from the Sims 3 folder.
Delete Game Cache Files (What & Howto)
http://www.carls-sims-4-guide.com/forum/index.php?topic=20732.msg401809#msg4018094. Repeat steps 1 - 3 till there is no more files to check.
** While your testing, don't save the game. If you find any problems, delete the mod or custom content file.
How To Find Problem Mods and CC -
http://simswiki.info/wiki.php?title=Game_Help:TS3_Finding_Problem_Custom_ContentIf none of the above help or you want more in-detail help with mods and custom content. You may want to ask over at a dedicated mod site, such as ModtheSims or TSR. These sites have more of a dedicated modding community that can be more helpful with questions like this.