[HTC One Mini 2] xxxmadraxxx:
Just another mini update from me:

As per previous post, I got a new U3 SDCard today and it's now in the phone.

Before I put in the new card, I thought I'd do some quick'n'dirty benchmarking to see how the camera performed with only internal storage in the phone, compared to with the new SDCard fitted. So thought I'd time how long it took to launch, save images and also how fast I could take sequential shots.

To my disgust, the first time I launched the camera it took no less than 47 seconds for the GUI to become responsive [as measured by time from tapping the camera icon until the icons, grid and focus bracket appears on screen]. I repeated the process twice more and got 20 second startup times both times. I also tested how quickly images where saved to disc. Although this is hard to judge accurately as you can only judge by the appearance of the thumbnail in the camera GUI, this seemed on a par with yesterday's performance [ie. not too bad].

Sequential shooting also provided a nice surprise; I was able to fire off ten shots in a row by repeatedly tapping on the screen [I'd say at a rate of around 1 shot per second], before [I suppose] the buffer filled and the shutter started mis-firing. The backlog of shots then took about another twenty or so seconds to write to disc [again, not bad at all].

I've then fitted the new SDCard and observed camera startup times [again, as measured by time from tapping the camera icon until the icons, grid and focus bracket appears on screen] of around 5 - 10 seconds and similar performance to the above with regard to sequential shooting and writing to disc.

I really am at a bit of a loss here now. On the one hand, after the camera has been launched and used a couple of times [and is presumably being cached in RAM], it seems quite usable; maybe a bit slow to start, but pretty responsive in operation and then, oddly, quite reluctant [or laggy] to shut down. However, if the phone has been sleeping or unused for a while, camera startup times are ridiculous. I've probably been over-generous before, estimating it at about 20-30 seconds, given I timed it at 47 seconds earlier.

So, I don't know if it's just this phone in general, or there's something fundamentally wrong with LineageOS [and its predecessor CM] that's causing apps to hang so badly when launched, if the phone has been idle for a while?

BTW --the other problem that's been plaguing me [and others] is still happening almost every time the phone wakes from sleep, namely the "Select a SIM Card" dialogue. I've also found that I can trigger it by opening Google maps. While the Google Maps interface is loading, I can see the phone signal indicator in the menubar turn off and on a couple of times. Then the "Select a SIM.." dialogue pops up.

I'm starting to get a bit fed up with this ROM, to be honest. I appreciate the hard work the developer has done in trying to bring LineageOS to this much neglected hardware but the seemingly insurmountable laggy camera problems and the irritation of having to dismiss that f**king "Select a SIM" dialogue [in a phone with only one SIM!] every time I wake the phone, are starting to feel like death by a thousand cuts.

I think it might be time to throw in the towel and roll back to stock.