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Hi @TheRealSlimShady
Please, try to boot your device into safe mode and check if this issue persists. I´m at disposal for any question.
Hi @TheRealSlimShady
***** Be aware that next suggestion will reset all settings of your apps *****
Try go to Settings -> Apps -> tap the 3 dots -> tap on Reset app preferences Then check if those problems persists or have disappeared. Please, keep us updated.
Sorry to hear that you have issues with your Z5 Compact 
If the issue remains, would it be possible for you to provide us with a log file from your phone that i could forward internally for further investigation?
I have the same problems with a Z5. Also it takes about 20-30 minutes from someone sends me an sms till it is recieved.
I have the exact same problems (slow, repeated sms etc) Transfered my text and settings from an old xperia acro s.
Seems this is a general issue? Will marshmallow update come soon and might that fix the problem?
I'd really like to keep the phone, but it is quite annoying to have a phone which basically can't handle sms!
We are also having this problem with a Z5 compact. Messaging app was working fine. Then we used the Sony PC companion to transfer around 200k messages (and other things) from an iPhone 4. The freezing / hanging seems to occur when a message has been sent and the sending is still happening in the background. Seems to take a while (at least 30 seconds) to send the message and during this time the messaging app hangs on "opening conversation" if you try to open any conversations (or if you leave and then try to reopen the messaging app). Once the message has actually sent and appears in the relevant conversation, then the messaging app works again. The same seems to happen when receiving messages.
Please help. If you need a log file, please explain how to provide this.
--Original message--
The conversations, whrn opened, take about 10-15 seconds! And also when I delete them.
It is very frustrating having to wait so ling everything I have to send a text through a conversation.
Whem sending thr msg doesn't show up and will only show up after closing and opening the conversation 2-3 times, each time taking 10-15 seconds.
The circle keeps spinning, can't even go back
Have to hit the home button.
May I add that I backed up about 71,000 msgs from my iPhone through Sony pc companion.
And I have tried clearing the cache, clearing data, force stopping and restarting.
Nothing works.
Please help.
According to support it might be not possible to use the backed-up sms. quite annoying for a company such as sony and their new "high-end" phone!