[Nook Color Android Development] Geezer Squid:
SWM is right. I installed it on my Droid in March of last year and it was fast, but ultimately proved to be unstable. The following is post I made about JIT. It was in March of last year (the links are surely not functional now as I think those websites are gone now). Also, ignore the optimism in the post because the stability did not last:

I’ve been running Bugless Beast roms since the end of January.

Everything that follows is all based on work done by t3hSteve. Here’s his description of the process: He rebuilt the file dalvikvm with JIT defined “and then copied libnativehelper, libdvm, and dalvikvm to my phone. Added dalvik.vm.execution-mode=int:jit to build.prop and rebooted”. After reading that short post, I started reading and googling until I learned how to do the same using his modified dalvikvm file. After reading (http://alldroid.org/viewtopic.php?f=210&t=1673 ) and learning that some folks that are running JIT are still having problems with browsers closing and with some force closes. I, on the other hand, knew that JIT had run well on my Droid with BB7.7. After all the reading, I was more convinced than ever that having Animations turned off was a key to successful operation with JIT. I have no technical reasons to support this position other than it seems that a lot, not all, but a lot of people that are having problems with JIT enabled are also mentioning how much they like Live Wallpapers. So taking those two tenuous data points (1. My Droid ran fine with 7.7 and JIT enabled and 2. I have animations turned off and most folks obviously do not due to the fascination with Live Wallpapers.) I decided to go for it. I then enabled JIT on my droid.

The results are pretty good so far. Before enabling JIT I would mostly get 159 - 179ms benchmarks. With JIT enabled I’m getting at lot of reading in the 130 - 150 range. I downloaded Linpack and promptly started getting readings in the 11’s. My best so far is 11.924 Mflops/s. So far so good. I’ve had absolutely no issues at this point. I’ve been running with JIT enabled for about 4 hours so far. It’s hard to operate the Droid and type with my fingers crossed. 

To accomplish this I added a line to the end of the build.prop file and replaced libdvm.so and libnativehelper.so with copies I got from t3hSteve. Here’s the procedure I followed:

1.	Make a full Nandroid backup and save a copy of it on the computer.

2.	Download the file “vmlibs.zip” here http://alldroid.org/download/file.php?id=1374

3.	Create a new folder on your sdcard named: JIT

4.	Extract vmlibs.zip to the new JIT folder on the sdcard.

5.	Open the JIT folder and create a new folder in it named Backup. This is where you are going to keep your current files that are going to be replaced: dalvikvm, libdvm.so and libnativehelper.so

6.	Disconnect phone from Computer. The following steps are going to be done with Root Explorer.

7.	Go to /system/bin and copy dalvikvm.

8.	Go to /sdcard/JIT/Backup and paste dalvikvm there.

9.	Go to /sdcard/JIT/bin and copy dalvikvm.

10.	Go to /system/bin and select the mount RW button

11.	Paste dalvikvm there – answer yes to the overwrite question.

12.	Long press the new dalvikvm file and choose Permissions and check every box.

13.	Press the Mount RO button.

14.	Go to /system/lib and copy libdvm.so and paste it in sdcard/JIT/Backup.

15.	Go to /system/lib and copy libnativehelper.so and paste it in sdcard/JIT/Backup.

16.	Go to /sdcard/JIT and copy libdvm.so.

17.	Go to /system/lib and press the “Mount RW” button.

18.	Paste the libdvm.so file there. Answer yes to the overwrite question.

19.	Go to /sdcard/JIT and copy libnativehelper.so .

20.	Go to /system/lib and paste the libnativehelper.so file there. Answer yes to the overwrite question.

21.	Press the “Mount RO” button.

22.	Go to /system and long press the build.prop file.

23.	Select “Open in Text Editor” in the window that opens.

24.	Open your physical keyboard and scroll to the bottom of the file and enter the following:

25.	Dalvik.vm.execution-mode=int:jit

26.	Press the phone’s Menu button and select “Save & Exit”

27.	Reboot

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Here's the adb vesion (don't know the source, it wasn't me):

abd pull /system/build.prop build.prop

Open in WordPad and add

Add as the last line:

dalvik.vm.execution-mode=int:jit

SAVE

adb shell mount -o remount,rw /dev/mtd/mtdblock4 /system

adb push dalvikvm /system/bin/

adb push libdvm.so /system/lib/

adb push libnativehelper.so /system/lib/

adb shell chmod 755 /system/bin/dalvikvm

adb push build.prop /system/

adb shell reboot

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I am not a dev and have no idea if any of this old stuff will help with the NC, but there it is!!

Good luck.