Mail app itself stutters and is very slow.

I installed Lion today with little problems until now. My Mail app (v 5.1) is excruciatingly slow. Scrolling up and down the list of emails shows to have a 1 to 3 second delay. If I closed out of the app and went back in to it, it would take minutes for the app to load and be functional. Emails get drafted and mailed with ease, but it's the function of the app that is currently the problem. I've checked things like clearing the cache, having all other app's closed, etc. and still nothing. My Safari works just fine - quick as ever and even over Airport. I can only guess there is something amiss between iCloud and Lion.
Thanks for any help or empathy out there!

What’s the capacity and space available on the startup disk?
Verify/repair the startup disk (not just permissions), as described here:
The Repair functions of Disk Utility: what's it all about?
Now, go to Apple Menu > System Preferences > Network > Show: Network Port Configurations, and make sure that the configuration used to connect to Internet appears at the top of the list.
Finally, try launching Mail with no Internet connection. Does Mail work properly while offline?

Similar Messages

Mail app keeps crashing (and other related problems)

A few days ago, my Mail app began crashing on seemingly unrelated events, so I assume my data got corrupted. I won't explain all the scenarios because it's a complete mess. To keep it simple, I have only 2 accounts and they are both on Gmail, so no backups are needed. I'd like to try doing a complete wipe of all data that the Mail app uses and that should fix it.
What files/folders does Mail use? So far, I've found:
~/Library/Mail
~/Library/Containers/com.apple.mail
I've also seen someone mention ~/Library/Preferences/com.apple.mail.plist, but I don't have this file.
After deleting the above and creating my mail accounts, the crashes are back. The only possibilities I can think of are:
1. I haven't deleted EVERYTHING owned by Mail yet. <-- What other files/folders belong to the Mail app?
2. Mail is depending on something else on my system that is broken.
3. Mail app itself somehow became corrupted.
4. Something being synced from my Gmail is not properly being handled, resulting in a crash.
When this started happening (if it helps):
1 day after installing the OS X update 10.8.3 as well as MacBook Pro Retina SMC Update v1.1, my MBP froze as soon as I loaded League of Legends. This was followed by a reboot as I couldn't Cmd+Tab out of the game. I wasn't aware of the Force Close App shortcut at the time, so I used the power button. That was the only time this happened, and it has worked fine a few times after the updates were applied and also worked after the reboot following the freeze. Since that time, I have encountered another issue where just about all of my apps crashed simultaneously -- no 3D-accelerated apps were even running this time.
Since then, I've updated VirtualBox from 4.2.8 to 4.2.10 (seemed like something that could cause this weirdness as I always have a VM running) and have not had any problems except Mail crashing all the time.
This question is primarily about fully resetting the Mail app to clean settings/data, but any thoughts on what may have happened are also welcome

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Step 1
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Enter the name of the crashed application or process in the Filter text field. Select the messages from the time of the last crash, if any. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.
Step 2
Still in the Console window, look under User Diagnostic Reports for crash reports related to the process. The report name starts with the name of the crashed process, and ends with ".crash". Select the most recent report and post the entire contents — again, the text, not a screenshot. In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

Mac os x lion 10.7 on mac book pro not updating and running very slow

i am using mac os x lion 10.7
problem it is not updating and running very slow. How to improve?

If you don't already have a current backup, back up all data before doing anything else. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve your problem. The backup is necessary on principle, not because of anything suggested in this comment. There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The procedure will help to identify which such modifications you've installed, as well as some other aspects of the state of the system that may be pertinent.
Don’t be alarmed by the seeming complexity of these instructions — they’re easy to carry out. Here's a brief summary: You copy a line of text from this web page into a window in another application. You wait about a minute. Then you paste some other text, which will have been copied automatically, back into a reply on this page. The sequence is: copy, paste, paste again. That's all there is to it. Details follow.
You may have started the computer in "safe" mode. Preferably, these steps should be taken while booted in “normal” mode. If the system is now running in safe mode and is bootable in normal mode, reboot as usual. If it only boots in safe mode, proceed anyway.
Below are instructions to run a UNIX shell script. It does nothing but produce human-readable output. However, you need to be cautious about running any program at the behest of a stranger on a public message board. If you question the safety of the procedure suggested here — which you should — search this site for other discussions in which it’s been followed without any report of ill effects. If you can't satisfy yourself that these instructions are safe, don't follow them.
The script will line-wrap or scroll in your browser, but it's really a single long line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then copy it.
If you have more than one user, and the affected user is not an administrator, then please run the script twice: once while logged in as the affected user, and once as an administrator. The results may be different. The administrator is the user that is created automatically on a new computer when you start it for the first time. If you can't log in as an administrator, just run the script as the affected user. Most personal Macs have only one user, and in that case this paragraph doesn’t apply.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign ($) or a percent sign (%). If you get the percent sign, enter “sh” and press return. You should then get a new line ending in a dollar sign.
Triple-click anywhere in the line of text below on this page to select it:
clear; PB=/usr/libexec/PlistBuddy; PR () { [[ "$o" ]] && o=$(sed 's/^/ /' <<< "$o") && printf '\n%s:\n\n%s\n' "$1" "$o"; }; PC () { o=$(egrep -v '^[[:blank:]]*($|#)' "$2"); PR "$1"; }; PF () { o=$($PB -c Print "$2" | awk -F'= ' \/$3'/{print $2}'); PR "$1"; }; PN () { [[ $o -eq 0 ]] || printf "\n%s: %s\n" "$1" $o; }; a=$(id | grep -w '80(admin)'); [[ "$a" ]] && sudo true && r=1 || r=; { [[ "$a" ]] || echo $'No admin access\n'; [[ "$a" && ! "$r" ]] && echo $'No root access\n'; system_profiler SPSoftwareDataType | sed '8!d;s/^ *//'; o=$(system_profiler SPDiagnosticsDataType | sed '5,6!d'); fgrep -q P <<< "$o" && o=; PR "POST"; o=$(($(vm_stat | awk '/Pageo/{sub("\\.",""); print $2}')/256)); o=$((o>=1024?o:0)); PN "Pageouts (MiB)"; s=( $(sar -u 1 10 | sed '$!d') ); [[ ${s[4]} -lt 90 ]] && o=$( printf 'User %s%%\t\tSystem %s%%' ${s[1]} ${s[3]} ) || o=; PR "Total CPU usage" && o=$(ps acrx -o comm,ruid,%cpu | sed '2!d'); PR "Max %CPU by process (name, UID, %)"; o=$(kextstat -kl | grep -v com\\.apple | cut -c53- | cut -d\< -f1); PR "Loaded extrinsic kernel extensions"; o=$(launchctl list | sed 1d | awk '!/0x|com\.apple|org\.(x|openbsd)|\.[0-9]+$/{print $3}'); PR "Loaded extrinsic user agents"; o=$(launchctl getenv DYLD_INSERT_LIBRARIES); PR "Inserted libraries"; PC "cron configuration" /e*/cron*; o=$(crontab -l | grep [^[:blank:]]); PR "User cron tasks"; PC "Global launchd configuration" /e*/lau*; PC "Per-user launchd configuration" ~/.lau*; PF "Global login items" /L*/P*/loginw* Path; PF "Per-user login items" L*/P*/*loginit* Name; PF "Safari extensions" L*/Saf*/*/E*.plist Bundle | sed 's/\..*$//;s/-[1-9]$//'; o=$(find ~ $TMPDIR.. $ -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $ | wc -l); PN "Restricted user files"; cd; o=$(find -L /S*/L*/E* {/,}L*/{A*d,Compon,Ex,In,Keyb,Mail/Bu,P*P,Qu,Scripti,Servi,Spo}* -type d -name Contents -prune | while read d; do ID=$($PB -c 'Print :CFBundleIdentifier' "$d/Info.plist") || ID=; ID=${ID:-No bundle ID}; egrep -qv "^com\.apple\.[^x]|Accusys|ArcMSR|ATTO|HDPro|HighPoint|driver\.stex|hp-fax|\.hpio|JMicron|microsoft\.MDI|print|SoftRAID" <<< $ID && printf '%s\n\t(%s)\n' "${d%/Contents}" "$ID"; done); PR "Extrinsic loadable bundles"; o=$(find /u*/{,*/}lib -type f -exec sh -c 'file -b "$1" | grep -qw shared && ! codesign -v "$1"' {} {} \; -print); PR "Unsigned shared libraries"; o=$(system_profiler SPFontsDataType | egrep "Valid: N|Duplicate: Y" | wc -l); PN "Font problems"; for d in {/,}L*/{La,Priv,Sta}*; do o=$(ls -A "$d"); PR "$d"; done; [ "$r" ] && { o=$(sudo launchctl list | sed 1d | awk '!/0x|com\.(apple|openssh|vix\.cron)|org\.(amav|apac|calendarse|cups|dove|isc|ntp|post[fg]|x)/{print $3}'); PR "Loaded extrinsic daemons"; o=$(sudo defaults read com.apple.loginwindow LoginHook); PR "Login hook"; o=$(sudo crontab -l | grep [^[:blank:]]); PR "Root cron tasks"; }; o=$(syslog -k Sender kernel -k Message CReq 'GPU |hfs: Ru|I/O e|n Cause: -|NVDA\(|pagin|timed? ?o' | tail -n25 | awk '/:/{$4=""; print}'); PR "Log check"; } 2> /dev/null | pbcopy; exit
Copy the selected text to the Clipboard by pressing the key combination command-C. Then click anywhere in the Terminal window and paste (command-V). The text you pasted should vanish immediately. If it doesn't, press the return key.
If you're logged in as an administrator, you'll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return. You may get a one-time warning to be careful. If you make three failed attempts to enter your password, the script will run anyway, but it will produce less information. In most cases, the difference is not important, so don't worry about it.
The script may take up to a few minutes to run, depending on how many files you have and the speed of the computer. Wait for the line "[Process completed]" to appear in the Terminal window.
You can then quit Terminal. The output of the script will have been copied to the Clipboard automatically. All you have to do is paste into a reply to this message by pressing command-V again.
Please note:
☞ This procedure is all copy-and-paste — type nothing in the Terminal window except your login password if and when prompted.
☞ Remember to post the output. It's already in the Clipboard when you see "[Process completed]" in the Terminal window. You don't have to copy the output; just paste into your web browser.
☞ If any personal information, such as your name or email address, appears in the output, anonymize it before posting. Usually that won't be necessary.

HT204266 my facebook application downloads pictures and videos very slow.Pictures are blurred as well.what to do.

My facebook app on Ipad downloads pictures and videos very slow. a few of the pics are also blurred.What to do?

Hi Skye_Starkey,
Im sorry to hear that you are having issues with your internet service. I know this can be very frustrating and I apologise for the inconvenience.
You can check to see if there is an outage in your area by entering your postcode and suburb in our service status checker: http://servicestatus.telstra.com/servicestatus/goc.do?q=summary.html
Please powercycle your modem and computer: Unplug from power > Leave off for 10 - 15 mins > then Plug back in and re start. This will often force a line update through to your modem advising the signal is restored.
Please make sure you have not exceeded you monthly usage allowance and have been shaped (slowed). You can do this via My Account http://tel.st/cpyn
Here are some other DIY support tools you can try.
Is your ADSL service running as fast as it could be?
http://crowdsupport.telstra.com.au/t5/Coverage-Network-KB/Is-your-ADSL-service-running-as-fast-as-it-could-be/ta-p/311953
How to test your speed
http://crowdsupport.telstra.com.au/t5/Home-Broadband-KB/Testing-your-broadband-speed/ta-p/278139
Make sure your modem settings are correct
http://crowdsupport.telstra.com.au/t5/Modems-Hardware-KB/BigPond-Modem-settings/ta-p/251263
ADSL Self service tool:
https://www.telstra.com.au/webforms/cares/
Change your line profile:
http://crowdsupport.telstra.com.au/t5/General-Internet-KB/Change-your-ADSL-Line-profile/ta-p/110182
How to peform an Isolation test:
http://crowdsupport.telstra.com.au/t5/General-Internet-KB/How-to-perform-an-Isolation-Test/ta-p/55014
ADSL Troubleshooting tips
https://go.telstra.com.au/helpandsupport/-/adsl-troubleshooting-tips
If you try all the steps in these articles and have no luck with your connection, Please speak to our Technical support team. You can contact them
on 133933 or you can also contact them via our Live chat service here: http://tel.st/49kl
Regards - Tom

Mail.app grabs more and more virtual memory... then quits

Hello all,
I'm running OS X 10.4.8, and Mail.app 2.1 and I recently had trouble with my internet connection (Verizon's fault). Now that I'm back up and running, Mail.app takes over my computer.
After I launch Mail, it seems to read my mail off the server okay, and shows it in the right window, but I get that spinning grey circle next to the icon for "inbox" (I normally see this whenever I'm checking mail), but the circle never stops spinning.
After noticing that my computer becomes slow as molasses, I was able to watch what was happening via the Activity Monitor utility. Mail.app starts out with about 100 Mb of Virtual Memory, but this number goes up, and keeps on going up. By the time it gets to 2 Gb Mail eventually quits "unexpectedly." But the whole time I've lost the ability to use the computer (even the mouse pointer hangs, I can't even point to the Dock, etc).
This behavior happens even when I unplug the computer from the internet (ethernet).
I've tried repairing permissions, but that had no effect. So now I'm left to only check mail using the mac.com website.
Thanks in advance.
iMac 800 Mhz G4 Mac OS X (10.4.8) 512 Mb RAM

Hello Chett.
Verify/repair the startup disk (not just permissions), as described here:
The Repair functions of Disk Utility: what's it all about?
Also, go to Apple Menu > System Preferences > Network > Show: Network Port Configurations, and make sure that the configuration used to connect to Internet appears at the top of the list.
How many accounts do you have and what type are they (POP, IMAP, .Mac)?
Do you have any Mail plug-ins installed? In the Finder, go to each of the following folders (if they exist). What do you see there?
/Library/InputManagers/
~/Library/InputManagers/
/Library/Mail/Bundles/
~/Library/Mail/Bundles/
Note: For those not familiarized with the ~/ notation, it refers to the user’s home folder. You can easily locate any of the folders referred to in this post by copying the folder path here, doing Go > Go to Folder in the Finder, and pasting the folder path there.

3 year old iMac 24 running OS10.7.4. After it has been on for a day or so, it stops going to sleep and becomes very slow. This only happens when Safari is running. Quitting Safari solves the problem. Has anyone else have the same problem?

3 year old iMac 24 running OS 10.7.4. After it has been on for a day or so, it stops going to sleep and becomes very slow. This only happens when Safari is running. Quitting Safari solves the problem. Has anyone else have the same problem? Does not happen on MacBookpro only on iMac.

Hello Albert, see how many of these you can answer...
See if the Disk is issuing any S.M.A.R.T errors in Disk Utility...
http://support.apple.com/kb/PH7029
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
Open Console in Utilities & see if there are any clues or repeating messages when this happens.
In the Memory tab, are there a lot of Pageouts?

Healing brush/Clone stamp tool and others very slow processing

Healing brush/Clone stamp tool and others very slow processing. System resources monitor shows only 700MB (of 5GB allocated to Photoshop) RAM and 30% CPU is used to perform such tasks as healing brush. Process bar comes up and is painfully slow to complete the task. I don’t understand why does Photoshop not use all the resources available/allocated? No other programs are running at the time, I have tried all the suggestions on this forum and all over the Google. My brand new system is: Intel I7 4770K overclocked to 4.3GHz, 8GB 1600 RAM, Samsung PRO 120GB SSD system drive, 100GB scratch disk. The photos I usually work on don’t exceed 20MB in size. Any suggestion would be appreciated. Thanks

Thanks for the answer.
I have not mentioned the GPU because the processes I described (as far as I know) are not supposed to be using GPU resources. So far I have not been able to afford the GPU i want which is GTX770, so I use Intel 4600 built in graphics instead. To be honest I find, that 4600 graphics is quite powerful. I am able to play Mass Effect 3 on Full spec on max res without game slowing down. And Windows 7 64bit index score is 7.8 for the 4600 graphics. Overall index score is 7.8 on my PC righ now.
I'll try to get the Photoshop system info as soon as possible.
Thanks again.
Zee

Videos skip and are very slow when I play them in anything other than fulls

When I try to play a video it is ok when it is in the small box in the corner but when i double click and get the video larger it skips alot and play very slow, but when I make the video full screen it play normally. How can I play the video in the mid size box in the right way.

Crop...
I'm having the same problem (iTunes 11.02!) .
I think this one isn't resolved because it IS rare: I've had iTunes on about 7 different machines (Mac and PC) since it begain (2001). In fact I maintain the same library without issues for over 10 years. Anyway this is the first time it's occurred (in my case it's happened on a pretty recent Mac Laptop). But as you may have discovered, google/bing searches for similar problems yeild VERY few results.
A guy at the Apple store was able to temporarily fix by doing some low level cache removal, that may give a glimpse to the reason, but is not a permanent fix.
I'm going to try a few things will report back if I have any luck**.
***If anyone else want to give it a try: Before starting bookmark the following: http://support.apple.com/kb/HT1391 this describes the location and purpose of most of the iTunes library files. And, any apple support docs on creating a new iTunes library... I'm unwilling to try the let iTunes "Keep iTunes Media folder organized " cause I have my own organization method.

Firefox maxing my cpu and runs VERY slow i have reset firefox and re installed it, diddnt work

firefox maxing my cpu and runs VERY slow i have reset firefox and re installed it, diddnt work i have googles searched about it and tryed so manny things to fix it but nothing works this is my last idea posting here

Did you do a clean reinstall and deleted the Firefox program folder?
*(32 bit Windows) C:\Program Files\Mozilla Firefox\
*(64 bit Windows) C:\Program Files (x86)\Mozilla Firefox\
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Mail App keeps freezing and crashing after yosemite upgrade. Cant create new emails.

Mail App keeps freezing and crashing after yosemite upgrade. Cant create new emails. Is there a fix to these issues?

Hi,
When I read these Threads in Yosemite I am filtered to show only the one listing Messages (the App) as the App involved.
This form of tagging a Thread no longer shows up in the current software used to run the Discussions.
Did you use the Mail and the Messages tags ?
It is difficult as many Mail help items refer to emails and "messages".
With me posting to the thread it should raise it to near the top again and maybe someone who knows about Mail will post.
8:03 pm Tuesday; February 3, 2015
 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

Adobe has upgraded itself (now red) relates very slow at best,locks up and just does not work.Is the

Adobe has upgraded itself( now red prompts ) and it operates very slow at best. it also locks up. Can I go back to old version or is there a fix?

Seem to have one more issue, when in documents and wish to move document to a folder. If I am require to scroll down to find a folder adobe closes on its own. Do you have any thoughts on this issue/
REGARDS

Mail restored.... now very slow and often sends multiple versions

Email is back.... with a caveat, very slow sending.
This may be another artifact of being a 1%er.
Jim

In case you are using "Clear history when Firefox closes": do not clear the Cookies
If you clear cookies then Firefox will also try to remove cookies created by plugins and that requires to start plugin-container processes that can slow down closing Firefox.
Instead let the cookies expire when Firefox is closed to make them session cookies.
*Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: Keep until: "I close Firefox"

Mountain Lion and Lion very slow on Macbook 13' 2010 Middle

The problem is the Mountain Lion and Lion very very slow, but Snow Leopard was fast.
The Lion bit faster, the Mountain Lion is much slower.
Animations are choppy and slow, but sometimes fast, but mostly random stuttering. If i have multiple windows opened, the Misson Control is very slow and useless. I think the system UI framerate is low (about 10-15 FPS)
Overall, the system response is very slow, and lagging.
I tried to clean dinstall several times, but this didn't help me.
I know that the new system is slower on older machines, but it would not be so necessary. This Machine is good machine, and i think this is enought for Mountain Lion. Will Apple fix this slow issue soon (maybe 10.8.3), or stay in this state?
At current state of the system is unusable due to the slowness.
Or is it a non official solution to fix this?
Thanks for your answers.

How much RAM do you have installed? 4 GB RAM is generally recommended as a reasonable minimum since kernel_task (part of system) consumes up to 1 GB; my browser consumes another 500 MB or so. So, if you like to multi-task and have several things open, then you will need to increase your RAM. This problem will not be fixed; I sent in a bug report and the reply was that this is how it is intended - 64 bit addressing consumes far more resources than 32 bit (Snow Leopard).
You'll need to look at your processes in Activity Monitor, quit some apps while working on others that are CPU intensive, and increase the RAM if possible.

How to stop mail app due to it is too slow

I have iphone 6 plus, recently my mail application suddenly become very slow, barely usable. So I downloaded yahoo mobile app, which is much faster. Now I want to disable mail so the icon will not be shown, so to save the resource on my iPhone . How can I do that? There is no X sign associated with it, not like other apps.
Also anyone know what might be the reasons for it becomes so slow?
Thank you very much.

The Mail app is a default app that comes with the operating system of the iPhone. It cannot be deleted and that is why you don't see the X. You can move the Mail app into a folder with other unused apps but you cannot delete it.

Have FF 3.1.6...less cumbersom. Lately it's been freezing up and is VERY slow to open. What's up with that?

Have FireFox 3.1.6...less cumbersome. Lately it's been freezing up (can't close page without using Ctrl, Alt, Delete) and it is VERY slow to open. What's up with that?
Have made no system changes. Have Avast for antivirus,. which updates itself regularly.
Run Sys Defrag a few times a week. Don't know what else to do other than uninstall and reinstall.
OS = XP Home

MacAficionadodel90 wrote:
... Is there a way I can go back to 5.11?
Sorry downgrading is not supported by Apple.
MacAficionadodel90 wrote:
... Now my iPad starts up slower...runs slower...
Try This...
Close All Open Apps... Perform a Reset... Try again...
Reset ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430
If no joy...
Connect to iTunes on the computer you usually Sync with and “ Restore “... either from Backup or as New...
http://support.apple.com/kb/HT1414
Also consider Deleting any Apps you have Purchased / Downloaded but you now never use..

Mail app itself stutters and is very slow.

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