Does your network support IPv6? Most modern versions of Linux do, but if your network does not then having it enabled just slows down address lookups. Opera does try IPv6 first, and then regular IPv4 ... there is nothing inside Opera to be changed, unless you want to disable the website security checks (which should be as slow in Windows as in Linux). If you're looking for a reason why Opera for Windows (12.x) and Opera for Linux would be different, it is probably due to IPv6 handling.
It seems to me that Opera (and operating systems) are increasingly forgetting that not everyone uses or wants tablets or smart phones. The traditional screen plus keyboard is still the only sensible way of inputting data into a database for example.
I have used Opera from way back when you needed to pay for a licence, but was delighted when it became 'free to use'. I am quite happy with version 12.16 on Debian and will be reluctant to switch to the more recent versions (which I have installed on a Win7) as too many of the standard features we have been used to are missing.
My biggest gripe is the change to the way bookmarks are used, I currently have around 200 in my present bookmark list, many of which relate to my genealogy research so easy access to them is essential. Switching to Speed Dial and looking for them in a folder isn't anywhere near so simple. At least the Bookmarks Bar is still available so I can put the most common ones there.
Untested. But, may be a .gtkrc-2.0 in your home folder helps:
slider-width = 9 # for example 9 pixels width
class "GtkScrollbar" style "scrollbar-style"
class "GtkVScrollbar" style "scrollbar-style"
class "GtkHScrollbar" style "scrollbar-style"
I dont know, but if Opera uses gtk3 then you should edit the gtk.css of the theme you use.
While Opera is closed, you can copy ~/.opera/mail to ~/.opera/mail_new. Then, delete ~/.opera/mail and rename ~/.opera/mail_new to ~/.opera/mail.
Or, just move the mail folder to a different drive and then move it back. Or, use some defrag utility.
You can also open up opera:config in the address field and uncheck "Load Mail Databases Asynchronously" under the "Mail" section. That will make Opera load the database faster.
Also, you can check the database.
Besides that, the only way to clean omailbase.dat is to rename your mail folder, start Opera, add all your accounts back in and import your messages back into each account. You'll lose your labels and what messages are in them etc., but it's sometimes worth it. You also won't be able to restore feed messages or newsgroup messages. You can export your feed list and import it back in though and set up your newsgroup accounts again.
To import messages back into their accounts, use "Menu -> settings -> import and export -> import mail -> import generic mbox -> add folder" where the folder you want is in the store folder. Just make sure to set "import into" to the correct account.
Now, if you just want to try the mail folder rename and import trick, just launch opera with the -pd "path_to_new_folder" command-line switch to create a new profile. You can then set up the accounts in it and import from your regular mail folder. That way, you can test things out to see if it really helps. It must be the generic mbox importer for it to help at all though. The other importers won't help.
Maybe I can hide it somehow? Just keep recent emails and move others somewhere but I will have access to them if needed.
Press shift + F12, goto "buttons" and then "mail" or "Mail view". There's a period button/drop-down that you can add to the toolbar above the message list. This is a per-view setting that you can use to hide older messages.
However, messages will still be in Opera and in the database. If you want to move messages out of Opera, export them, create a new Opera profile and import them into it. Then, you can delete the originals from your normal Opera. Then, whenever you want to see those old messages, you just load the other Opera profile and look at them. Or, if you're going to do the rename mail folder and import trick, choose to only import messages from this year for example. Then, have another profile to import the rest of the messages for each account. It's up to you.
Opera shouldn't really be that slow. 90K messages isn't a lot for Opera.
That was a safety feature added in 12.15 ... it is common in Windows for programs to change the default search - sometimes without even asking permission. So they changed it so that only one of the built-in searches can be set as default. You may still be able to choose no default at all, but you can't choose an added search engine as default nor remove a built-in search engine.
Sounds like the database became corrupted for some reason. Perhaps it's been corrupted for a while and it just recently got really bad.
How can I fix it?
In opera:config, under the "Mail" section, set "Mail Database Consistency Check Time" to 0, save and shut down Opera. When Opera asks, run a database check. Opera will then shut down, scan the database and try to fix some things if it can. The results will be logged to recovery.log in "/home/user/.opera/mail".
If that doesn't fix it (and it likely won't), rename the mail folder while Opera is closed. Then, start Opera up and set up your mail accounts again. Then, goto "Menu -> settings -> import and export -> import mail -> import generic mbox -> add folder" and browser to "/home/user/.opera/mail/store/accountN" where N is the number for the account as seen in accounts.ini. In the import dialog, choose what account pop account to import into. Repeat the steps for each of your POP accounts.
After the importing is all done, if you have duplicates of messages (an imported copy and a copy fetched from the server when you set up the pop account), delete the imported copies.
You'll have to readd your labels etc., but it'll get your messages back.
There's no way to restores you feed messages (as feed messages. You can import them as mail messages though) that way. But, you can export your feed list before you close down Opera and rename the mail folder and import it into the new mail folder. You'll have to readjust each feed's update interval though.
Now, if the messages in question were removed from the server and from the accountN folder, then they're gone.
Also note that for IMAP accounts, you just set them up again. You don't import at all to restore them.
On another note, if Opera just isn't seeing new messages on the server anymore, you can have Opera redownload all messages in the inbox for the pop account (and fix the problem at the same time) by deleting the uidl file for the account in the pop3 folder in the mail folder.
Also, if you have the exact same setup on windows, you can just copy the mail folder and contacts.adr and use them to replace the ones on Ubuntu. Then, it'll be an instant fix.
Android code is in Linux now (Google sent the code to Linux), so some sites might mix them up (lots of web devs and browser makers with test with different UA strings to see what a site sends a browser)
You might check http://www.opera.com/docs/browserjs/ see if you have the browserjs file from Jan 2014 (other browsers have similar things to try to fix bugs in sites (work arounds))
Turning off the address popup? How to do this in Opera for Linux. Wheneeve I hover over a link with my cursor, about a second passes and the complete address appears in a popup that obscures the information on the screen below it. I find this very disconcerting and want to turn it off. Does anyone know how to do this? I have used Opera for Linux on my desktop and that did not happen, so it seems that some setting is different, but I could locate it.
You are actually hijacking this topic, as your question/problem has nothing to do with this topics subject, other than the fact that Linux is mentioned. You should really have posted your own topic.
But seeing as you are already here, go to 'O Menu / Settings / Preferences... / Advanced / Browsing' and remove the tick from 'Show tooltips' on the right had side and click 'Ok'.
Things should be back to normal when hovering links with your mouse pointer now.
You should have an accounts.ini file in your \profile\mail\ folder. That's what you need to import mail accounts.
Just copying the \profile\mail folder and all of its subfolders to the new installation's profile folder should work without having to import anything.