When a call comes in, it often takes so long to answer that the caller has hung up. And when I open an app, it often happens the I get the “App isn’t working” message and have to start again. Is it time to get an FP6?
Not necessarily, the FP3 isn’t as snappy as it was or a newer and more powerful smartphone is. But normally not as slow as you describe it.
Can you tell us more about your phone? What software is running on it? How much free space does it have? Do you use a µSD card, probably as internal memory extension?
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I have Android 13, Build 6.A.039.4 and 11.15 GB free. No µSD card.
You could possibly try to free up some space and if nothing helps try to backup everything and do a factory reset.
For sure the FP3 is no race horse, but it’s normally not as laggy as in your experience.
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You could also try installing a different launcher (Fossify Launcher is a basic one, for example) to see if that solves the problem of apps closing. As for the delay in answering calls, I don’t know if the dialer app has anything to do with it, but it might be worth trying another one (Fossify Phone is what I’m currently using).
Ultimately, it may be worth trying a factory reset… my FP3 is 6 years old and still relatively fast… at least not as slow as you say.
Good luck 
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On my FP3 with the stock Android I have found that doing this has made it a bit quicker:
Enabling Developer options and in Developer options section, for all the 3 ‘animation scale’ type settings, setting them to ‘Animation off’.
I can tell that this has helped, but I’m curious if others have found other things that can be adjusted to speed it up, which is why I’ve signed up on the forum. I’ll do some sleuthing here and see what I can find out…
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I’m trying the factory reset…
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Try a new battery cheaper and more ecologic.
I had problema like you and changing battery makes it working again
PS I’m on eos
Are you sure that helps?
For eos there may be some kind of battery saving mode (with lower speeds) when the battery voltage is lower, but for Android that is not the case. Speed of a digital device usually does not depend on the battery voltage.
Not sure what should change with a new battery regarding performance?
I have long ago disabled UI animations (you can do the same in Windows 11 btw), but recently have more problems with responsiveness, like described here, perhaps due to apps becoming “fatter”. Also I’m sticking to Android 11, no compatibility or security issues so far. Android 13 Go (the “light” version) requires 2GB RAM as absolute minimum, so I’m worried that my FP3’s 4GB will not really suffice for good performance of a regular A13 with a typical amount of apps installed.
I also believe that the number of apps that we now use everyday, or at least have installed for use once a year, plus the increasing resource consumption of each app, is a big part of the problem. This can be seen by the phone almost freezing when turning on Bluetooth or Wi-Fi after the night, several apps seem to do background stuff once connectivity is available. Including VLC player doing a media scan as soon as BT is turned on, can’t disable that, very annoying.
Energy saver mode can help sometimes, as it suppresses background activity. However, frequent switching between apps is often slower that way, and there will be less notifications (news, email etc).
I have yet to try a different launcher and phone app.
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That will definitely help, but it’s also a lot of work. Especially reconfiguring your apps. Also, upon reset, Google asked me to confirm my login with the authenticator app (two factor authentication!) which I did not have yet, because the phone was just reset. So stupid. So be sure to have some one-time passwords available, or disable your 2FA (not sure whether that is possible..)
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My adventure and experiences here: Factory reset costs a lot of time - should we just accept this?
I try to use some applications through the browser, creating a shortcut on the desktop so that they run full screen mode, thus avoiding having to install some of them (social networks, Duolingo, dictionaries and some others). Obviously, this depends on each person’s usage, but sometimes we are not aware that we can simply run many applications from their web version conveniently without having to install them 
.
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I rogue you that battery shoud be the problem. As soon as I change the battery of my fp3 it revive as new one.
I have a FP3+ since 2021. Since a couple of months it’s very slow. Not just a bit but really slow. It seems to be worse after I didn’t use it for a while e.g. in the morning when I wake up or after doing sports. When it first occured I already tried some things as trying to delete cache files from diverse apps, threw away different apps in order to try to make more space. But this didn’t work really, it temporarily got a bit better but now it’s even worsened. When I open an app it takes really minutes to open it in the meantime my screen is turning black sometimes after a while trying and waiting the app works. Sometimes the app works for a moment and than it says that the app doen’t work and I have to choose closing it or waiting. If I choose waiting because it worked just before I got the same message popping up also if the app just works okay. Also I get different messages e.g. System IU not working, Quickstep not working etc.
I am a bit frustrated this happens all the time. It gets really annoying now and it makes me nearly buying a new phone. But I wanted to use it at least 5 years and we are not yet there. I am buying FP because of sustainability but I have the feeling other phones last longer….. all my FP’s crashed or got similar problems after about 4 years. Is there something I still can try? Or do I have to accept that it’s lifespan is just ending?
It says it uses 61 GB out of of 64 GB and in percentage has 86% of the storage in use. Much of the storage are apps (44 GB) and I don’t really have apps I can throw away anymore.
Anyone that knows a possible solution?
It could be that your storage is giving problems.
Is there a chance that you could backup photos and after checking remove some of your phone?
The same for the file Downloads. Many times you can delete files there.
You could delete some apps you hardly use. You can always re-install them.
Thanx for your reply. I did already remove photos and downloads. But I did make new photos again so maybe I can try to remove these as well. I will try that and see if I can remove apps that I use only once in a while.
Otherwise I will need tot try options some people suggested above I think, to back up everything and set it back to factory settings and installing it again. And maybe install another launcher app. But I have to think about it if it is worth the time and effort.
Trying a new launcher should be rather easy. Also, use a SD card as external memory an tell your camera app and others to use it directly as storage. Streaming apps can often be set to SD storage for downloaded content. Also, delete the Cache for a number of apps, in your storage settings you can see which one takes much cache space.
A full reset is probably not worth the significant effort. Yes, at some point the number of apps that we use nowadays, and the resource demands of each of them becomes too much for a 6 year old phone, sadly.