Bluetooth mouse lag

I have been investigating this issue with my MacBook 13"
My Logitech BT mouse, V470, is erratic and jumps/lags after a short time of use.
I found a "JHHPortGet" process running at 99.9% CPU, and the CPU fan also running flat chat.
Cancelling this process improves the BT mouse operation.
However, as I was about to write this post, I again noticed some mouse movement issues, but to a lesser extent.
I conclude that the Mac's bluetooth processes are not getting enough priority over some other processes, causing intermittent mouse op.
The "JHHPortGet" process is a mystery, as theres no mention of it anywhere with Google, accept for a Chinese blog post with as yet no replies. I think this warrants a new post specific to "JHHPortGet" process.
Its safe to assume that other high-priority processes will steel CPU time from the Bluetooth Process.
If the BT process could be given a higher priority, this may fix the issue for many Mac users.

Update;
Altho' terminating the JHHPortGet process has improved the Logitech V470 mouse operation, Its now usable, but randomly exhibits the same problem, for short periods now.
And the mouse seems to be just a tiny bit hard to control all the time now, testing on mouse compatible surface.
Contrary to my previous post, I could see no process running at high CPU that may be causing issue.
The issue now lasts for about 15 secs rather than being permanent. Perhaps a WiFi or BT app is steeling time from the mouse comms.
Unlike others reporting similar mouse issues related to USB ports, I have mo USB devices plugged in.
Help needed please Apple !

I have the same issue with my bluetooth mighty-mouse and bluetooth touchpad (both Apple devices). It does not appear to be related to the peripheral devices, but rather the Mac's AirPort Wireless hardware. It looks like it just runs into problems when under heavy loads.

You describe the issue as being erratic / intermittent, but can you correlate the issue occurring only when you have heavy Wireless LAN activity? To test this, use Activity Monitor to check your system resources. You will probably be able to correlate the issue to the Wireless Network traffic loads and not the CPU or Memory loads.

Try moving a large file across your wireless network, you should see lag / stuttering issues with the bluetooth mouse. Now try using a cabled network connection and move the file; you won't experience the mouse lag/stuttering.

Thanks Gormagon,
Yes its exactly as you describe.
The BT mouse becomes erratic during heavy Wireless LAN activity!
Several tests correlate the issue directly to the Wireless Network traffic loads.
There may also be a correlation between the CPU load as I first described, or perhaps the JHHPostGet process was also loading the Wireless Port.
But certainly, even small network traffic interferes with the BT mouse operation.
Also, Turning off Airport makes the Mouse control much better, even without any network traffic.

I have also had same problem with a Microsoft BT mice and keyboard I normally use on the WinXP machine and a Kensington BT mouse that requires a USB-BT dongle.

So the problem lies with the MacBook/OSX Bluetooth and Airport firmware/hardware.

I wonder if there has been any OSX updates to address this issue?

Also,
Interestingly, Downloads to the MacBook around 300kB/s have only small effect on mouse operation and DLs of around 3.6MB/s result in more erratic mouse. But Uploads of 2MB/s effect the mouse op dramatically.
Q. Shouldn't a WirelessN connection be faster than 4MB/s?

To help identify the cause of this issue and get apples attention to fix this:
Could everybody that had this same issue "BlueTooth Mouse Lag" please Post your
[Hardware] Model Identifier and [Software] System Version and Kernel Version:
All this info is available from the Apple >> About this Mac >> More Info or the System Profiler app
Ill start:

Model Identifier: MacBook6,1
System Version: Mac OS X 10.6.4 (10F569)
Kernel Version: Darwin 10.4.0

This issue has been extensively reported by many Mac users here also:

http://forums.macrumors.com/showthread.php?t=689131

Looks like the USB, WirelessN port and BT port all use the same port or bus.
Heavy traffic on one interupts the BT tasks.

Please Fix this APPLE...

Update:
Upgraded to 10.6.5 - No difference..
Changed/tried all wifi channels - No change to problem.
Tried a Mac Mouse - slightly less effect but still unusable.
Tried a USB BT dongle type mouse (no using internal BT AP) - Same issue
Tried on a friends Wireless Network - Problem only slightly evident - to be expected as this was a slow network at about 1.9MB/s, a transfer speed that does not show the problem.
Tried using a Netgear wireless intBT mouse router - Problem is only slightly evident on Mac Mighty Mouse, worse on Logitech, evident slightly on ext BT mouse.
With the Wireless nw running a transfer at 3MB/s, this Network speed drops down to a very slow speed when the "Set up Bluetooth Device" utility is initiated.

So given that this issue is also experienced by MacBook owners when using BT mouse while doing a File transfer via USB external HDD, or Time Machine. My conclutions are either:
1.
The USB ports, BT chipsset and Airport Chipset are all using the same data bus in the Macbook.
This data bus is not capable of running a high speed, contiguous data transfer in a single direction AND transfer BT wireless data at the same time. Apple Architects may be able to work around this issue by appling higher priority to BT data transfer tasks (Mouse), as it does when the "Set up Bluetooth Device" utility is running.

or
2. The BT wireless hardare is eisily susseptable to RF interference. This dont explain USB drive influences however.

My best bet is to log a Hardware repair request with Apple, as this is indeed a Hardware issue.

QUOTE RemoteONE
"My best bet is to log a Hardware repair request with Apple, as this is indeed a Hardware issue"

I did this - spoke with Support Rep.

This is the Apple suggested way to resolve (for my hardware - Mac Book PRO purchased OCT 2010 - apparently there are different functions for different hardware).

1) Press and hold: SHIFT + Control + Option
2) whilst holding the above button combination - press POWER BUTTON once only, then release
3) Shut down machine
4) Power on machine - at first chime (not before), PRESS and HOLD: COMMAND + OPTION + (letter P) + (letter R) don't let go - hold until second chime
5) Release after second chime

He advises this will resolve problem - apparently it is a known problem. I have a case number, and they have asked me to monitor for re-occurance.

Thanks for the info Rat,
The MacBook is in at apple service today. They had never had anyone else report this issue.. never heard of it.. I get that a lot !
Lets see how they go with it. If Apple Service aren't willing to fix it, I'll give it a try.

Regarding the apple suggestion.
1. Was there any explanation as to what this procedure actually did, what changes were made by this procedure??
2. Whilst carrying out the steps, Did you also need to be facing East, while standing on one leg, grasping a left testicle?

3. And has this "procedure" fixed the problem?

Cheers

I've also seen this problem on a 2009 MacBook Pro with an Apple Bluetooth keyboard and Logitech V470 bluetooth mouse.

The problem only exhibited when I plugged in a large (2048x1152, Dell SP2309W) monitor - it's fine with another 1280x1024 monitor.

I worked around the issue by enabling 'Higher Performance' graphics in Sys Prefs/Energy Saver. It's a bit cumbersome having to do this everytime I attach the monitor, but the mouse lag is gone.