Hi,
i used the "Power save" option in "Tweaks - GPS" some days ago and yesterday i encountered a very bad first GPS fix. My mobile needed a very long time to find the satellites and get a fix. I then changed the setting back to "Default" and i got a very fast fix.
My idea: Always use the setting "Fast" till the first GPS-Fix and set it then back to the chosen setting. Is that possible?
For now you have to use a low "Minium Time" in the GPS-Settings to get a fast fix.
Update: I found the problem. Two years ago i set the "accuracy to position gix" to 100 m, because the gps fixing of my device was very bad. Now i changed the value back to 20m and it works great now.