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Why is my app running slow on an older version of android

I am building an app for college project, when I tested it on Virtual Device- Pixel 2 API 30 Android 11, it is running smoothly, but when I am testing it on my physical device which is Redmi Note 3 running on Android 6 (Marshmallow) it is sticking.

Reason is android version. Try creating a virutal system which has android 6 marshmallow, it will behave same.

ERROR: "The selected device is incompatible" in Android HTC device

I am absolutly new in Android development (I am a Java EE developer) and this is the first time that I use Android Studio.
So I am finding some difficulties to run my HelloWorld application on my HTC One phone.
I have installed the driver of my phone on my Windows 8.1 system (it should be ok because I can correctly see my phone into the Windows Device Manager).
So I open my app into Android Studio and then click on the start button and then I can choose perform the application on my phone but then I obtain the following error message:
The selected device is incompatible
Here a screenshot of the problem:
Why? What is the problem? How is it possibile that my Htc One is incompatible with Android Studio? How can I fix this issue?
Another problem is that if I chose Launch Emulator instead my phisical phone I have not a virtual device. Is is something that have I to instal separatly or what?

Sometimes reasons may be your device is not recognized by Android Studio.
For this to happen do the following:
Settings -> Developer Options -> Revoke USB debugging authorizations.
Select OK and disconnect your phone. Reconnect it, run the app and you should get a popup on your phone asking for authorization with title "Allow this Device..." . Tick the checkbox for future prefrence. and Select Ok.

You have created the app with min SDK version 15 (as mentioned in the snapshot) but your device is working on a lower version of android. You can change the min SDK version from project properties or create a new application project with lower or equal version of android SDK than the android version installed on your device.
The version of SDK, you select, will work on any device having same or higher version of android OS installed.
Gingerbread (version 10) will work on ~90% of the devices.

It seems the minSdkVersion defined in the grade file of your project is higher than the api version of your phone. So you should change minSdkVersion.You can only start a virtual device, if you have previously downloaded a system image and configured the device with AVD Manager.

Android Emulator does not run or runs very slowly

I am very enthusiastic in learning and developing android applications using the native java language. Sadly my emulator is not running at all. It ran once but it was very very very slow. I am using Eclipse and the Android ADT bundle.
If it is a hardware thing here then please see my specs below. As far as I'm concerned, these are pretty decent specs for a laptop for developing apps.
Can anyone shed some light on why the emulator is unable to run properly? I really would like to start developing apps as soon as I can.

You can try three things:
Check whether your processor supports Intel HAXM. This will make the
emulator as fast as real device.
Try GenyMotion.
Alternatively, consider developing on Linux. The Linux kernel contains a module called kvm that is the equivalent of the Intel HAXM driver on Windows. The emulator is blazing fast on Linux with any kind of processor.
References:
1. Why is the Android emulator so slow?.
2. Speed up your Android Emulator!.
3. 8 Tips to Speed Up Your Android ARM Emulator.
4. How to speed up the Android Emulator by up to 400%.

The stock emulator is very slow. I had the same issue currently I am using Genymotion emulator which is way to better than the emulator that is packaged with the SDK.
here the download link:
https://www.genymotion.com/#!/download
Though it does not have all the features available for free

Android Google Maps V2 not working in Emulator

I have been trying for the last 2 hours now to get the map to work in the emulator on Mac. I have followed several suggestions on Stack such as this and this I have tried over and over again, are these out of date?
I have done several new projects, fresh virtual devices, cleaned all the time and it's just not working. Any suggestions?

I had the same problem as you ask after installing apk files I have successfully run the google map version 2 on Android version 4.2.2 level 17 emulator. I have spend 2 days to find what is the problem.
make sure you have updated version of google api with latest updated version.
and google play service in extra folder of Android Sdk Manager.
Link To follow all step to start map v2 on emulator: https://blog-emildesign.rhcloud.com/?p=527
steps:
1) delete your current AVD or Genymotion emulator
2) create new AVD or Genumotion emulator
- Device: select Device any
- Target: choose target as you want but make sure it should be 4.0 or greater
- CPU: Intel or ARM
- RAM, Heap, Internal storage, sd card: it should be lower according to your pc specification means if you have good RAM and process then go for the higher as you can.
you need to install
three apk files on emulator
1) com.android.vending.apk
2) com.google.android.gms.apk ( above both are given in the link)
Note: Google play service apk (gms) version should be same as your
google play service library mention in your code. Check google play
service library version name and download the same version of apk file
3) com.google.android.maps
EDIT:
if you have successfully install all these on your emulator without failure then you will definitely open google map on emulator.
one more thing I would like to suggest you that version of google play service library that you refer in you project should be same as you install google play service apk file. It is not mandatory but some time you may face the same problem google play service version miss match error.
I have found some link hope it will help you. Apk file download link:
For,
gms: http://uploaded.net/file/bnzl1si4
vending: http://www.androidfilehost.com/?fid=9390135922294521859
Hope it will help you.

Android device update for G1

I am using android G1 phone and now I have upgraded my SDK to 1.5 and I want to run my application on a physical device, but when I connect my phone to PC I'm able to install my app only when I'm selecting 1.1 SDK but not when selected 1.5 .
So is there any updates required for the device so I can proceed with 1.5 SDK? Also, if possible can you provide with a proper link? That would be great.

An update for your phone will be pushed OTA by your operator, just wait. If it is a dev phone look at HTC pages.

If you're in the US or UK you can find instructions on how to force-upgrade here. I did it on mine and it went fine.