I"m NOT saying .3 is worse than previous versions, as they weren't exactly blindingly fast, but I've been doing more work recently (MN in winter leaves a lot of time for playing inside) and I'm noticing more and more that there are areas in Lightroom where I see sluggish performance.
My system is an ASUS X99 Deluxe, with a 5820K running at 4.4GHz, 32GB of 2400MHz Ballistix memory, EVGA 970 GTX graphics board, 1TB 840 EVO SSD for O/S applications, LR catalogs, cache and so on. Images are on a 2 disk 7200 rpm RAID0 array and a Wacom Intuous 4 tablet. Windows 10 Professional.
I've unplugged the tablet.
ALL the disks go through weekly optimization (including the SSD) and show 0% fragmentation. Windows 10 is a new 1511 installation installed from SCRATCH after the 1511 upgrade totally bollixed the operating system.
I THOUGHT some of the problem MIGHT be the wireless trackball so I plugged in a wired trackball.
I re-installed Lightroom 2015.3 with the new Windows installation.
I have a monitor running that provides information on temps in each core and the percentage busy.
Images are fairly large - Nikon D810 shooting full FX.
A typical folder contains 800-900 images, so there aren't a lot of images in any one folder.
In Grid, for example, using the mouse wheel induces a lag. It's SOMETHING LIKE roll the wheel, wait, roll, images jump, roll and images move normally, roll, lag, roll, images move part of the distance they should. It doesn't APPEAR to be specific in that it lags every time I roll the wheel, but there's a frequent, perceptible lag. Even using the right scroll bar to scroll all the way up or down it'll jump, jump, jump, lag, jump, lag, jump... Again, not consistent, but there are periodic points where it'll lag.
On imports, it IMPORTS quickly, but generating standard previews is slow. On a RE-install of 710 .dng images, using and ADD so there no movement or conversion, and monitoring performance, the CPU ranges between 40 and 55% busy, memory is just over 4GB, and disk activity between 15 and 22 MB/s - virtually all READS on the RAID 0 array, and all writes to the SSD, which causes barely a blip on the display. Import time is approximately a minute, but time to create STANDARD previews is over ELEVEN MINUTES.
Pressing ctrl/A to select all the images in the folder results in a delay before the images are selected.
Needless to say, operations in develop like adjustment brushes and other local adjustments can likewise show lags.
All the above is anecdotal, but typical of what I'm seeing on a daily basis. In another topic I found an entry indicating that the Wacom tablet should be unplugged. Mine IS UNPLUGGED.
And to "trash" the preferences. Mine have been and been recreated.
And yet another indicated that the problem MAY be because the work being done in LR has exceeded the technology's ability to keep up. Since this system never gets anywhere near full CPU usage, memory usage, or disk read or write maximums, I presume LR isn't exceeding the system's capabilities.
My current images, at 36 megapixels are large, but not significantly larger than the 24 megapixel images commonly created, and are quite a bit smaller than the 50 megapixel images Canon is currently creating, so I'd hope performance issues aren't still being blamed on image sizes.
Does anyone have ideas for tuning either Lightroom or the system to get rid of (or at least significantly improve) the sluggishness I'm seeing?