I have done some searching on this forum and on twitter and I really can't find too many people complaining about build 10512 being worse than 10166. First off let me say that I knew Windows 10 was pretty much feature locked and wasn't expecting anything new. So with that in mind, what I WAS expecting was a lot of improvements in stability, performance, and bug fixes. I assume that was the goal for this build and being that the last one was nearly a month ago, they had a lot of time to fix issues and improve performance. This is only from my experience with my 929, I haven't tested it on my 822 yet (not much really).
So, to my surprise, here is what I found to be worse than build 10166. (this is not a list of bugs from 10512, just what I observed to be there NOW that was not before.)
1. Lock screen takes at least 3 seconds to show information when pressing the power button. Sometimes it doesn't show it at all. This can get very annoying when trying to quickly access the time or see information. No problems at all with 10166.
2. Stuttering animation from start screen to all apps list. Perfectly smooth on 10166.
3. No notifications on the lock screen for email, messaging, NOTHING. Nothing displays on the lock screen but time and date... ever. Didn't have this problem with the last build.
4. Random sounds play for text messaging. When I first heard the notification sound for text messages, I thought it was a nice new sound, but then the old one (from the last build and Windows 10) would play on future messages, then sometimes I get the 8.1 sound for text messages, its all over the place. There doesn't seem to be any rhyme or reason why one sound plays over the next. With 10166 it was the standard notification sound like on desktops for Windows 10.
5. Text message toasts, notifications, and sometimes sounds don't work with this build.
6. Messaging app crashes more frequently than in 10166.
7. When pressing the camera button on the phone, it opens the Lumina Camera app (after I took my first picture with this build). When that app opens up I see the last picture I took full screen and I can't do anything about it. When I touch the screen to try and bring up a menu or do something, it turns the flash light on or off. The only was to get out of it is to close the app. So I have to open the camera app via all apps menu now to use the camera, not sure how to fix this.
So these are all the problems I have with 10512 that WEREN'T there with 10166 or are worse now. On top of all the small bugs and problems that came with 10166. I literally see ZERO improvements from this build, like literally nothing is better only worse. I'm not one of those people who complain about issues without understanding the scope of the situation. I KNOW this is a preview build and I know there will be bugs. I'm just surprised that a much newer build (that had over a month of development) with a much higher build number would have more issues than the previous one. I also don't really see the noticeable overall speed of the OS being faster like Dan and Zac from Winbeta talked about.
And before anyone says anything, yes I did I hard reset, let the phone sit, and did a soft a reset..as with previous builds. I would love to hear feedback on this and see if I'm the only one who feels this way. On the same token I thought it was strange hearing a lot of people complain about 10166 and all the problems they had with it. For me, 10166 was just as smooth and fast as 8.1 and I had almost no issues, I was really excited for this build to fix the minor ones that were there.
With all that being said, I'm still excited for Win10 Mobile and will continue to test preview builds and send feedback. Windows 10 mobile still looks promising and can't wait for the final release.
So, to my surprise, here is what I found to be worse than build 10166. (this is not a list of bugs from 10512, just what I observed to be there NOW that was not before.)
1. Lock screen takes at least 3 seconds to show information when pressing the power button. Sometimes it doesn't show it at all. This can get very annoying when trying to quickly access the time or see information. No problems at all with 10166.
2. Stuttering animation from start screen to all apps list. Perfectly smooth on 10166.
3. No notifications on the lock screen for email, messaging, NOTHING. Nothing displays on the lock screen but time and date... ever. Didn't have this problem with the last build.
4. Random sounds play for text messaging. When I first heard the notification sound for text messages, I thought it was a nice new sound, but then the old one (from the last build and Windows 10) would play on future messages, then sometimes I get the 8.1 sound for text messages, its all over the place. There doesn't seem to be any rhyme or reason why one sound plays over the next. With 10166 it was the standard notification sound like on desktops for Windows 10.
5. Text message toasts, notifications, and sometimes sounds don't work with this build.
6. Messaging app crashes more frequently than in 10166.
7. When pressing the camera button on the phone, it opens the Lumina Camera app (after I took my first picture with this build). When that app opens up I see the last picture I took full screen and I can't do anything about it. When I touch the screen to try and bring up a menu or do something, it turns the flash light on or off. The only was to get out of it is to close the app. So I have to open the camera app via all apps menu now to use the camera, not sure how to fix this.
So these are all the problems I have with 10512 that WEREN'T there with 10166 or are worse now. On top of all the small bugs and problems that came with 10166. I literally see ZERO improvements from this build, like literally nothing is better only worse. I'm not one of those people who complain about issues without understanding the scope of the situation. I KNOW this is a preview build and I know there will be bugs. I'm just surprised that a much newer build (that had over a month of development) with a much higher build number would have more issues than the previous one. I also don't really see the noticeable overall speed of the OS being faster like Dan and Zac from Winbeta talked about.
And before anyone says anything, yes I did I hard reset, let the phone sit, and did a soft a reset..as with previous builds. I would love to hear feedback on this and see if I'm the only one who feels this way. On the same token I thought it was strange hearing a lot of people complain about 10166 and all the problems they had with it. For me, 10166 was just as smooth and fast as 8.1 and I had almost no issues, I was really excited for this build to fix the minor ones that were there.
With all that being said, I'm still excited for Win10 Mobile and will continue to test preview builds and send feedback. Windows 10 mobile still looks promising and can't wait for the final release.