Safari loading very slowly - Firefox loads immediately

I have seen a few postings about Safari loading slowly since the upgrade to Yosemite but this is really starting to aggravate me now. I am having no problem whatsoever when loading the same pages in Firefox - which in fact is how I am having to write this posting.
Is ti just me?
Any ideas greatly appreciated.

Linc
While I was aware of this posting I have my concerns about whether it is applicable in this case. It relates to Safari 5.0.1 or later - the latest version of Safari in Yosemite is 8.0 and I have not experienced any noticeable problems until the last few days - although the posting states that last amendments were made only 3 weeks ago its level of detail re Windows and referring to such an old version of Safari lead me to think it is quite a few years since it was written. Why has it suddenly happened? Why does Safari carry out DNS pre-fetching in the first place? What functionality am I losing by disabling it? If Apple are aware of this issue (and if they are not then how is it going to be fixed?) and they fix it in an update then how will I know it has been fixed? Will it be incumbent upon me to re-enable DNS pre-fetching to regain whatever functionality I lost when turning it off?
Sorry to ask all these questions but I hope you can see where I am coming from.
David

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1. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve the problem.
2. If you don't already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
3. Below are instructions to run a UNIX shell script, a type of program. All it does is to collect information about the state of the computer. That information goes nowhere unless you choose to share it. However, you should be cautious about running any kind of program (not just a shell script) at the request of a stranger on a public message board. If you have doubts, search this site for other discussions in which this procedure has been followed without any report of ill effects. If you can't satisfy yourself that the instructions are safe, don't follow them. Ask for other options.
Here's a summary of what you need to do, if you choose to proceed: Copy a line of text from this web page into the window of another application. Wait for the script to run. It usually takes a few minutes. Then paste the results, which will have been copied automatically, back into a reply on this page. The sequence is: copy, paste, wait, paste again. Details follow.
4. You may have started the computer in "safe" mode. Preferably, these steps should be taken in “normal” mode. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.
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6. The script is 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, though you may not see all of it in the browser window, and you can then copy it. If you try to select the line by dragging across the part you can see, you won't get all of it.
Triple-click anywhere in the line of text below on this page to select it:
PATH=/usr/bin:/bin:/usr/sbin:/sbin; clear; Fb='%s\n\t(%s)\n'; Fm='\n%s\n\n%s\n'; Fr='\nRAM details\n%s\n'; Fs='\n%s: %s\n'; Fu='user %s%%, system %s%%'; AC="com.autodesk.AutoCAD com.google.GoogleDrive"; H='^[[:space:]]*((127\.0\.0\.1|::1|fe80::1%lo0)[[:space:]]+local|(255\.){3}255[[:space:]]*broadcast)host[[:space:]]*$'; NS=networksetup; PB="/usr/libexec/PlistBuddy -c Print"; A () { [[ a -eq 0 ]]; }; M () { find -L "$d" -type f | while read f; do file -b "$f" | egrep -lq XML\|exec && echo $f; done; }; AT () { o=`file -b "$1" | egrep -v '^(A.{16}t$|cann)'`; Ps "${1##*/} format"; }; Pc () { o=`grep -v '^ *#' "$2"`; l=`wc -l <<< "$o"`; [[ l -gt 25 ]] && o=`head -n25 <<< "$o"`$'\n'"[$((l-25)) more line(s)]"; Pm "$1"; AT "$1"; }; Pm () { [[ "$o" ]] && o=`sed -E '/^ *$/d;s/^ */ /;s/[-0-9A-Fa-f]{22,}/UUID/g;s/(ochat)\.[^.]+(\..+)/\1\2/;/Shared/!s/(\/Users\/)[^/]+/\1-/g' <<< "$o"` && printf "$Fm" "$1" "$o"; }; Pp () { o=`$PB "$2" | awk -F'= ' \/$3'/{print $2}'`; Pm "$1"; }; Ps () { o=`echo $o`; [[ ! "$o" =~ ^0?$ ]] && printf "$Fs" "$1" "$o"; }; R () { o=; [[ r -eq 0 ]]; }; SP () { system_profiler SP${1}DataType; }; id -G | grep -qw 80; a=$?; A && sudo true; r=$?; t=`date +%s`; clear; { A || echo $'No admin access\n'; A && ! R && echo $'No root access\n'; SP Software | sed -n 's/^ *//;5p;6p;8p'; h=(`SP Hardware | awk '/ Id/{print $3}; /Mem/{print $2}'`); o=$h; Ps "Model"; o=$((h[1]<4?h[1]:0)); Ps "Total RAM (GB)"; o=`SP Memory | sed '1,5d;/[my].*:/d'`; [[ "$o" =~ s:\ [^O]|x([^08]|0[^2]|8[^0]) ]] && printf "$Fr" "$o"; o=`SP Diagnostics | sed '5,6!d'`; [[ "$o" =~ Pass ]] || Pm "POST"; p=`SP Power`; o=`awk '/Cy/{print $NF}' <<< "$p"`; o=$((o>=300?o:0)); Ps "Battery cycles"; o=`sed -n '/Cond.*: [^N]/{s/^.*://p;}' <<< "$p"`; Ps "Battery condition"; for b in FireWire Thunderbolt USB; do o=`SP $b | sed -En '/:$/{s/ *:$//;x;s/\n//;s/\n.*//;/\)/p;};/^ *(V.+ [0N]|Man).+ /{s/ 0x.... //;s/[()]//g;s/(.+: )(.+)/ (\2)/;H;};/Apple|Broadcom|Genesy|Intel|SMSC/{s/.//g;h;}'`; Pm $b; done; o=`pmset -g therm | sed 's/^.*C/C/'`; [[ "$o" =~ No\ th|pms ]] && o=; Pm "Thermal conditions"; o=`pmset -g sysload | grep -v :`; [[ "$o" =~ =\ [^GO] ]] || o=; Pm "System load advisory"; o=`nvram boot-args | awk '{$1=""; print}'`; Ps "boot-args"; fdesetup status | grep -q On && o=on || o=; Ps "FileVault"; a=(/ ""); A=(System User); for i in 0 1; do o=`cd ${a[$i]}L*/Lo*/Diag* || continue; for f in *.{cr,h,pa,s}*; do [[ -f "$f" ]] || continue; d=$(stat -f%Sc -t%F "$f"); [[ "$f" =~ h$ ]] && grep -lq "^Thread c" "$f" && f="$f *"; echo "$d ${f%%_2*} ${f##*.}"; done | sort | tail`; Pm "${A[$i]} diagnostics"; done; grep -lq '*$' <<< "$o" && printf $'\n\t* Code injection\n'; o=`syslog -F bsd -k Sender kernel -k Message CReq 'caug|GPU |hfs: Ru|last value [1-9]|n Cause: -|NVDA\(|pagin|proc: t|Roamed|rror|ssert|Thrott|timed? ?o|WARN' -k Message Ane 'SMC:' | tail -n25 | awk '/:/{$4=""; $5=""};1'`; Pm "Kernel messages"; o=`df -m / | awk 'NR==2 {print $4}'`; o=$((o<5120?o:0)); Ps "Free space (MiB)"; o=$(($(vm_stat | awk '/eo/{sub("\\.",""); print $2}')/256)); o=$((o>=1024?o:0)); Ps "Pageouts (MiB)"; s=( `sar -u 1 10 | sed '$!d'` ); [[ s[4] -lt 85 ]] && o=`printf "$Fu" ${s[1]} ${s[3]}` || o=; Ps "Total CPU usage" && { s=(`ps acrx -o comm,ruid,%cpu | sed '2!d'`); n=$((${#s[*]}-1)); c="${s[*]}"; o=${s[$n]}%; Ps "CPU usage by process \"${c% ${s[$((n-1))]}*}\" with UID ${s[$((n-1))]}"; }; s=(`top -R -l1 -n1 -o prt -stats command,uid,prt | sed '$!d'`); n=$((${#s[*]}-1)); s[$n]=${s[$n]%[+-]}; c="${s[*]}"; o=$((s[$n]>=25000?s[$n]:0)); Ps "Mach ports used by process \"${c% ${s[$((n-1))]}*}\" with UID ${s[$((n-1))]}"; o=`kextstat -kl | grep -v com\\.apple | cut -c53- | cut -d\< -f1`; Pm "Loaded extrinsic kernel extensions"; R && o=`sudo launchctl list | awk 'NR>1 && !/0x|com\.(apple|openssh|vix\.cron)|org\.(amav|apac|calendarse|cups|dove|isc|ntp|openld|post[fg]|x)/{print $3}'`; Pm "Extrinsic daemons"; o=`launchctl list | awk 'NR>1 && !/0x|com\.apple|org\.(x|openbsd)|\.[0-9]+$/{print $3}'`; Pm "Extrinsic agents"; o=`for d in {/,}L*/Lau*; do M; done | egrep -v 'com\.apple\.(CSConfig|server)' | while read f; do ID=$($PB\ :Label "$f") || ID="No job label"; printf "$Fb" "$f" "$ID"; done`; Pm "launchd items"; o=`for d in /{S*/,}L*/StartupItems; do M; done`; Pm "Startup items"; sys=`pkgutil --regexp --only-files --files com.apple.pkg.* | sort | uniq | sed 's:^:/:'`; b=`sed -E '/^.+Lib.+\/Contents\/Info.plist$/!d;s/\/Info.plist$//;/Contents\/./d' <<< "$sys"`; l=`egrep '^/usr/lib/.+dylib$' <<< "$sys"`; [[ "$b" && "$l" ]] && { o=`find -L /S*/L*/{C*/Sec*A,E}* {/,}L*/{A*d,Compon,Ex,In,iTu,Keyb,Mail/B,P*P,Qu*T,Scripti,Sec,Servi,Spo}* -type d -name Contents -prune | grep -Fv "$b" | while read d; do test -f "$d/Info.plist" || continue; ID=$($PB\ :CFBundleIdentifier "$_") || ID="No bundle ID"; printf "$Fb" "${d%/Contents}" "$ID"; done`; Pm "Extrinsic loadable bundles"; o=`find /usr/lib -type f -name *.dylib | grep -Fv "$l"`; Pm "Extrinsic shared libraries"; :; } || echo $'\nReceipts missing'; o=`for e in INSERT_LIBRARIES LIBRARY_PATH; do launchctl getenv DYLD_$e; done`; Pm "Inserted dylibs"; o=`find -L {,/u*/lo*}/e*/periodic -type f -mtime -10d`; Pm "Modified periodic scripts"; o=`scutil --proxy | grep Prox`; Pm "Proxies"; o=`scutil --dns | awk '/r\[0\] /{if ($NF !~ /^1(0|72\.(1[6-9]|2[0-9]|3[0-1])|92\.168)\./) print $NF; exit}'`; i=`route -n get default | awk '/e:/{print $2}'`; I=`$NS -listnetworkserviceorder | sed -En '/ '$i'\)$/{x;s/^$.+$ //p;q;};x'`; n=`$NS -getdnsservers "$I" | awk '!/^T/{printf "not "; exit}'`; Ps "DNS (${n}from DHCP)"; o=`$NS -getinfo "$I" | awk '/k:/{if ($3 !~ "(255\.){3}0") print $3}'`; Ps "Netmask"; R && o=`sudo profiles -P | grep : | wc -l`; Ps "Profiles"; f=auto_master; [[ `md5 -q /etc/$f` =~ ^b166 ]] || Pc $f /etc/$f; for f in fstab sysctl.conf crontab launchd.conf; do Pc $f /etc/$f; done; f=/etc/hosts; Pc "hosts" <(egrep -v "$H" $f ); AT $f; Pc "User launchd" ~/.launchd*; R && Pc "Root crontab" <(sudo crontab -l); Pc "User crontab" <(crontab -l); R && o=`sudo defaults read com.apple.loginwindow LoginHook`; Pm "Login hook"; LD="$(`find /S*/*/F* -type f -name lsregister | head -n1` -dump)"; o=`for ID in $AC; do [[ "$LD" =~ $ID ]] && echo $ID; done`; Pm "Application check"; Pp "Global login items" /L*/P*/loginw* Path; Pp "User login items" L*/P*/*loginit* Name; Pp "Safari extensions" L*/Saf*/*/E*.plist Bundle | sed -E 's/(\..*$|-[1-9])//g'; o=`find ~ $TMPDIR.. $ -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $ | wc -l`; Ps "Restricted user files"; cd; o=`SP Fonts | egrep 'id: N|te: Y' | wc -l`; Ps "Font problems"; o=`find L*/{Con,Pref}* -type f ! -size 0 -name *.plist | while read f; do plutil -s "$f" >&- || echo $f; done`; Pm "Bad plists"; d=(Desktop L*/Keyc*); n=(20 7); for i in 0 1; do o=`find "${d[$i]}" -type f -maxdepth 1 | wc -l`; o=$((o<=n[$i]?0:o)); Ps "${d[$i]##*/} file count"; done; o=; [[ UID -eq 0 ]] && o=root; Ps "UID"; o=$((`date +%s`-t)); Ps "Elapsed time (s)"; } 2>/dev/null | pbcopy; exit 2>&-
Copy the selected text to the Clipboard by pressing the key combination command-C.
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Safari Booting Very Slowly....

For some reason Safari has been taking an ususually long time to turn on. Before this started happening, the icon would bounce 2 or 3 times in the dock and then it would be on. Now it bounces for perhaps 30 seconds and when it does turn on, it lags for a minute or so. I've noticed that Adium (MSN/iChat combo) does this as well. For that matter, it seems to be getting worse in regards to everything.
Please help!
Macbook Mac OS X (10.4.10)

Hello Kyle:
Welcome to Apple discussions.
Do you have at least 10% of your HD free? If other applications are behaving in the same fashion, you have a problem that is not specific to Safari.
Run the hardware checker that came with your system to see if anything pops up.
Barry

Safari starts very slowly

I am running Panther (10.3.9) with the latest updates. PowerBook G4 1GHz with 512MB RAM. Lately I've noticed that Safari takes a long time to start, i.e. the Safari icon bounces 30-40 times (~1 min.?) before it starts, whereas before it only bounces 3-4 times (within seconds). It simply takes a long time but nothing really has changed on this machine. I tried emptying the cache on all accounts and this hasn't helped. What gives?

Looks like I solved the problem. I turned off Airport, shut the computer down. I was going to try using the built-in ethernet port to see if it has anything to do with Airport itself (since Mail was having the same problem too). Turns out I didn't configure my ISP settings for the ethernet port, so I turned back on airport to retrieve the settings from the ISP's website. Low and behold, Safari starts almost instantly. Mail is back to normal speed now too.
It was the turn off and on of airport plus the system shutdown that fixed it. Don't know which worked but thanks for the tips.

Suddenly my firefox loads SO slowly. I launch firefox first and then Safari and Safari loads pages before firefox enen begins too. Also a LOT more adds show pages I looked at previously.

Several weeks ago Firefox suddenly was / is very slow to load all pages. I launch Firefox. Wait. Launch Safari. Safari loads page while I am still waiting for Firefox.
Why?

Do you use NoScript? There's possibly an issue with NoScript where certain settings cause Firefox to load HTTPS pages on startup very slowly.

The FireFox Browser loads itself very slowly and makes me wonder if it is loading at all. Is there something that can be done to speed up the FF Browser loading?

FF Browser 5 loads itself very slowly and takes so long with no sign that it is loading that many times I will click it again and later find that it has loaded itself twice.
Is there anything that I can do to speed the start-up of this browser?
It seems that if there is not a way to load this browser faster that FireFox would make an add on that would show us that the Browser is in process of loading at the very least. Thank you for your kindness in any way for help in this regard. Best Regards
Sincerely Walt

cmauze2 wrote:
Ann154 wrote:
What happened to your old SIM card? You should have been able to move that card to the new replacement device.
[quoted]:
"Sales clerk asked me if I had a Sims card for it. I told him that there`s one in my old phone. He explained to me that it was not going to be working..."
Or were you referring to the one in the old temporary replacement device? Would that even be compatible with the newer phones?
The one that wasn't working had a 4G LTE SIM card in it. It should have usable in the replacement Razr. It was only until I read the OP a third time this morning that there might be a third device involved. It would be nice if people would give more specifics on what devices are active at what time. Then the readers of this community can follow the progression of the events better.

Firefox 28, 29 and 30 load pages very slowly - Google Chrome is OK on the same PC...?

Windows XP SP2 on a Dell Precision 340, Pentium 4, 2GB RAM, two GeForce MX4000 graphics cards, AVG Internet Security 2014. Broadband connection with download speeds up to about 27Mb/s.
I get the same symptoms on a homebuilt system with an almost identical spec.
Internet pages with any graphics at all load very slowly. Reliable websites like BBC News can take at least 30 seconds to open, making Firefox unusable for surfing.
Google Chrome, on the same PC, opens the same pages in about 4 seconds.
Firefox running under Ubuntu Studio 9, on the homebuilt PC, is also fine, so I don't think it's my internet connection.
Firefox 30, on Windows 7 64-bit Professional with Norman Endpoint Security, is fine on my work laptop.
What's slowng down Firefox 30 on my Windows XP machines please?

Sorry you are having problems. Thanks for a good descriptive post. There is a testcase; see under; does the globe spin slowly ?
Just a hunch at the moment but maybe the problem described in this thread.
* ''Firefox is unbearably slow after updating to version 27'' [/questions/985969]
** summary [/questions/985969?page=3#answer-546599]
** my general comments [/questions/985969?page=3#answer-546520]
* Useful page as '''testcase''' globe should spin at 15 RPM <br /> https://en.wikipedia.org/wiki/File:Rotating_earth_%28large%29.gif
Not engineers have now started to investigate so there may be further news later in the week
There is a testcase as above.
Bugzilla used for bug tracking and reporting
*Please only vote though do not add comments unless it is brand new information, or it is something asked for in the bug.
** https://bugzilla.mozilla.org/page.cgi?id=voting.html
**https://bugzilla.mozilla.org/page.cgi?id=etiquette.html
**[https://bugzilla.mozilla.org/show_bug.cgi?id=973149 Bug 973149 - Animations cause CPU Kernel mode overhead]
**Follow by using CC <br />You are able to follow the bugs by using the [Save] option whilst the []CC option is checked.
** Note you need an email address to register with bugzill and that will be made public

Firefox is loading pages very slowly, most of times saying server not found. Same pages loaded quickly in ie9. Previously FF used to load pages fast. FF version 8.0.1, windows vista & windows XP.

firefox is loading pages very slowly, most of times saying server not found. Same pages loaded quickly in ie9. Previously FF used to load pages fast.
FF version 8.0.1, windows vista & windows XP.
Please help
Generally we dont get any reply to the questions asked here!

65kid wrote:https://bbs.archlinux.org/viewtopic.php?id=162327
Thank you for the link, but I am not sure how this is going to help me: I am not booting straight to an X session, but prefer to log into TTY1 and have my login shell handle everything from there.
Here is the relevant part of my .zprofile:
if (( UID )); then
[[ -z $DISPLAY && $XDG_VTNR -eq 1 ]] && exec systemd --user
fi
As far as I understand, your method works if I enable the [email protected] template when actually booting straight to X.

Website loads very slowly in Safari....

I have had my website for quite a while and all of a sudden, when I try to view it in Safari, it loads very slowly and each time the welcome page loads, there are pictures missing. I have not done anything different to my site. Is this a problem with Mobileme or iWeb or both?? My site is captured4u.com
Thanks

First, not a bad page.
A quick analysis of the home page provides this information:
Documents (4 files) 28 KB
Images (33 files) 972 KB
Objects (0 files)
Scripts (9 files) 291 KB (296 KB uncompressed)
Total 1300 KB (1305 KB uncompressed)
For Reference, Apple's current home page provides the following sizes:
Documents (2 files) 3 KB (9 KB uncompressed)
Images (20 files) 143 KB
Objects (0 files)
Style Sheets (2 files) 6 KB (30 KB uncompressed)
Total 250 KB (502 KB uncompressed)
The current MSN.com portal page shows:
Documents (4 files) 19 KB (52 KB uncompressed)
Objects (0 files)
Scripts (7 files) 74 KB (158 KB uncompressed)
Style Sheets (3 files) 17 KB (65 KB uncompressed)
Total 228 KB (393 KB uncompressed)
I can't speak for past performance, but any page that is over a MB in size does take longer to load. A problem with your page is that you have an idea of how to add pictures and make the layout how you want it to look, but there is a price the viewer has to pay to download all of those graphics, including some of the text that are being converted to graphics by iWeb (which means Google can't read some of your categories for their index).
I don't find that iWeb does a very good job of optimizing graphics for the web. They work, but dedicated graphics programs like Photoshop or even Photoshop Elements will do much better when the files are resized and saved for web properly.
You would probably do better to simplify the home page with larger single graphics for each category that are used to point to other pages with more related photo's and descriptions. Remember, even the fancy picture frame outlines are more graphics the viewer has to load, and you need to be aware of when iWeb is going to convert your text into graphics either because you are not using standard web safe fonts, are rotating the text or adding other fancy attributes.
Design and optimization are always a compromise. iWeb is not always smart about optimization, and mobileme is not the best solution for speed. They're fairly easy to use, but go easy on them...

Firefox loads very slowly, other browsers run fine

Firefox has been loading webpages very slowly, whereas any other browser I use will load them much faster. I can even start loading a page in Firefox, open a different browser, load the same web page, see that it gets fully loaded in the second browser, close that browser, and swtich back to Firefox, and Firefox will not have the page visibly loaded yet. It is for this reason that I know the problem is not with my internet connection.
I use Firefox on my Windows 8 computer with no problems - it is actually one of the fastest browsers that I've used; I'm having a problem with it on a Windows 7 computer. I've tried several other fixes I've found on this site - disabling add-ons, starting Firefox in safe mode, clearing the cache, and enabling hardware acceleration. None of these have helped speed up Firefox. I'm no sure what else I could do at this point.

It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to install for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating
Create a new profile as a test to check if your current profile is causing the problem.
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 files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Webpages loading very slowly??

I haven't made any changes to my connection lately, but it is now suddenly running very slowly. I'm running 10.4.11 with all updates. The Internet (Safari, Firefox, and Mail) runs very slowly and takes minutes to load webpages, and sometimes doesn't load at all. I have made changes to the router, but it didn't fix the problem. Any suggestions? Should I scan for viruses?

When websites don't load, I now get this "Road Runner Web Site Suggestion" site that I have never gotten before. This leads me to believe that it has something to do with the ISP.
Also, I don't lose or drop my wireless connection, it just loads web pages extremely slowly until the point where it sometimes goes to this Road Runner page.

Iweb 09 pages load very slowly - How can I fix this?

Hi-
Just published my website to ipage.com and every page is loading very slowly despite the fact that the backgrounds and graphics are very simple (Many of the pages are text only). I'm using the "Modern theme" Blank with a gradient fill, which is what seems to be causing the slowdown. I've tried it on two computers (macbook and macbook pro), two browsers (safari and firefox) and my iphone 4 - performance is equally poor on all three. Spoke to my Web Hosting technical support (I'm using Ipage) and he says my site is only using 17 mb, which should not cause any issues. My download speeds are also very fast so it's not my computers that are causing the issue (Between 20.5 and 23.2 mbps, ping=18ms). The site address is www.jeffreyjanger.com.
Thanks,
jeff

Bonjour
the slowness is explained by the big size of gradient fill image. Your background [image|http://www.jeffreyjanger.com/JeffreyJanger/Home_files/backgroundimage_11.png] is a PNG
You've changed color opacity, that forces iWeb to create a PNG file.
if you let opacity to 100%, iWeb will create a JPEG file
In an iWeb published site, JPEG file size can be 25% smaller than PNG (and sometimes more...)

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