P: Add the possibility to disable full image preset preview

OMG PLEASE turn this off.  You have completely ruined my workflow and LR comes to a screeching halt when using presets.  AT LEAST make it a preference that you can enable or disable.  You're adobe.  You're supposed to be the best.  To not think of this is ridiculous.

Please NOT an option in settings. Would be able to activate/deactivate this feature by a toggle/button (above the presets for example) or activating it by a keystroke. Think this way, all people would be happier than going always into the setting dialog

With respect, I disagree with the automatic transformations of my main image even if the computer could instantly display the view. It is extremely disconcerting to have the main image changed without my asking just because I happened to move my mouse over some magical area. It is not Adobe's image to make a game with, it is my image and it should not be changed without my intent. It is enough to have a small preview area display the general effect when the mouse is over the preset button. If I decide it looks interesting, I could click on the button to apply it temporarily to the main image for a proper rendering. If I want to assign it, double-click. Or perhaps the single click assigns it in a permanent way and a little Undo button pops up on the preset button I just clicked as a way to remind me which preset I am considering. Anything along those lines would be fine, but don't mess with my main image just because I moved my mouse across the screen. Good grief, this should have been covered in User Interface 101.

Also, and obviously, holding down the Alt/Option key for temporary fullsize preview would be useful. And I guess a switch for people who want it on all the time. Sure. But don't be messing with my image just because I moved the mouse.

I like this new option IF.... my older Imac could keep up but it can't. So until I upgrade my work station I would like to turn this off. We should definitely have the option to disable it. 

I prefer off by default, using the small window to preview presets as it was before.  That method was manageable.  If you set it to "on by default", you will certainly alienate any new subscribers who use laptops.

Off by default, otherwise new subscribers won't understand why their laptops are so slow, or spin the fans up due to the heat.

IIRC, when they released first improved 7.x version they said that they worked with Intel on optimizing multithreading in LR. There's also Intel Thread Building Blocks  (TBB) library dll in the main LR folder. So yeah, it looks like it's better optimized for Intel, which is sad, considering how good Ryzen/Threadripper platforms are. This is the last thing that keeps me from upgrading current i7-3770 setup to the new Ryzen 2000 platform instead of Intel's last-gen offering.

IIRC, when Adobe released first improved 7.x version they said that they worked with Intel on optimizing multi-threading in LR. There's also Intel Thread Building Blocks  (TBB) library dll in the main LR folder. So yeah, it looks like it may better optimized for Intel, which is sad, considering how good Ryzen/Threadripper platforms are. This is the last thing that keeps me from upgrading current i7-3770 setup to the new Ryzen 2000 platform instead of Intel's last-gen offering.

Strange... On the desktop, AMD 8 Core, 16GB + Nvidia 1080, previews lag for almost 2 seconds. On the old much hammered laptop from waay back in 2012, quad i5, 8GB, intel gfx (unsupported for lightroom) the previews are silky smooth and virtually instant. Compiled and optimised for intel chips / intel only features used per chance?

Hi,

I vote for an ON/OFF button that should be quickly accessible all the time. It's not only a problem with those users who want this feature on and those who don't like it. At some moments, e.g. when browsing through a large set  of presets, I don't want the live preview to be enabled. This makes the screen flashing. Once I have eventually landed in the right preset folder (or group ?), having this feature enabled will be useful.

A good location would be in the Presets panel title bar. However, this assumes that it is always visible. Which in turn assumes that scrolling occurs in the Presets panel only and not in the whole left tab. Otherwise, the panel title bar quickly disappears.

Another good choice would be the toolbar under the viewing area, beside the viewing and attribute options.