[Galaxy S I9000 Android Development] RyanZA:
This software is currently in BETA status! This means that a lot of people have tested, and reported good results. There are still issues, but if you take note of the known issues and make sure to avoid them, you very likely will have no problems in using this fix. The worst this software should be able to do is force you to reflash your phone, by removing the battery and turning on the device with HOME+VOLDOWN+POWER + Odin and then following one of the many guides to flash a new firmware to your phone.

More questions about how this fix works? Check out the FAQ - http://xdaforums.com/showpost.php?p=7620940&postcount=2

UPDATES:

There is currently a 2-3 version made by me that can be found here that has more features: http://xdaforums.com/showthread.php?t=751864

Tayutama has made an update.zip version that is easy to install - http://xdaforums.com/show...&postcount=208

Chainfire has a .NET version of this fix with some nice features - http://xdaforums.com/showthread.php?t=751513

Ubuntu version is here: http://xdaforums.com/showpost.php?p=7671640&postcount=583

[size=+2]DEPRECATED:[/size]

[size=+1]This lagfix is now marked as DEPRECATED and the following tool should probably be used in all circumstances that this one would be used in: http://xdaforums.com/showthread.php?t=760571[/size]

Details about what this fix does:

Creates a VIRTUAL EXT2 filesystem inside the stock RFS filesystem on the internal SD card, with a 4KB block size. This means that this lag fix creates a buffer between the real filesystem and the android system. This buffer should reduce the amount of disk I/O required for all operations by utilizing EXT2 buffering, as well as not writing file access times to disk, etc. It allows only 1GB for application data at this stage, down from the 2GB of application data when running stock.

Folders that are currently supported:

/data/data

/data/system

/data/dalvik-cache

More folders can be added, and should help performance further.

Advantages for this fix over mimocan's fix

Does not require an external SD card.

Allows the external SD card to be removed and reinserted into the device.

Faster speed (Quadrant benchmarks of 2000+ vs 1700 for mimocan's fix)

Possible battery savings, by not requiring the external SD card to be always active.

Requirements for this fix

(Beta Release) The ability to reflash your device if something goes wrong.

Any firmware should work, including 2.2 froyo firmwares. (Tested!)

Rooted device - I used this: http://www.addictivetips.com/mobile...t-samsung-galaxy-s-i9000-with-a-single-click/

Busybox 1.17.1 from http://xdaforums.com/showpost.php?p=7574130&postcount=229 -

You must have a busybox version installed that has mkfs.ext2. If unsure, install 1.17.1 from that thread!

That thread has an APK that you must sideload onto your device. Once installed, you will have a new application on your phone called "BusyBox Installer".

Run this application, and it will have a button to install busybox. Click the button, and it should install it for you!

If you have made a mistake and run this without the right busybox, there may be a solution for you! Check out this post: http://xdaforums.com/showpost.php?p=7580071&postcount=187

A windows box to run the batch script. (Batch script does very little, you should be able to easily modify this to run in any enviroment.)

If you are already running mimocan's lag fix, check out this post: http://xdaforums.com/showpost.php?p=7578137&postcount=85

How to run the one click fix

Place your phone into USB debugging mode: Settings->Applications->Development

Download the attached ZIP file.

Unzip to a folder of your choice.

Double click "lagfixme.bat"

Wait for it to complete.

How to remove the one click fix

Double click "unlagfixme.bat"

Wait for it to complete.

New Method for applying this lag fix

Tayutama has developed an update.zip version of this lag fix. I haven't tested it personally, but some people have had a lot of success with it. It should be more robust and less likely to cause you problems. I believe it avoids all rooting and busybox issues as well! Nice! Check out this helpful post by glockyboots for instructions. You must only use one lag fix, not both! http://xdaforums.com/showpost.php?p=7587405&postcount=417

Known Issues

1) If you do not have 1GB of free space on /data, this fix won't be able to run. Looking into workarounds.

2) Script fails if your busybox does not have mkfs.ext2 - Solution is to update busybox - http://xdaforums.com/showpost.php?p=7574130&postcount=229

3) Script will not work if you have previously used mimocan's fix on your current firmware. Try this to revert mimocan's fix: http://xdaforums.com/showpost.php?p=7578137&postcount=85

4) Make sure your device is plugged in, and that you have the correct drivers. Permission denied errors usually mean that your device is not in USB debug mode. Settings->Applications->Development

Credits

Big thanks to mimocan for putting us all on the right track in how to sort out lag problems!

Big thanks to ykk_five for showing us all how well loopback filesystem mounting works!

Warning, this software is BETA QUALITY, and is known to function on a lot devices! You must have busybox 1.17.1 !

This doesn't meant that this won't break your phone and force you to reflash. It does mean that if you do everything properly and you read everything a few times, you very likely will have no issues!