PAC Display Runtime running very slowly - displays freezing

So far, there has been no issues with runtime with the above settings. If we remove the exceptions the issue comes back. Eventually I would like to isolate this down to a specific setting, I’ll test it more the next time I am on site. There are a total of six exceptions setup and I believe this is specific to the latest Win10 build (1903). Another machine with 1809 runs fine, but they are going to update it soon so I’ll see if the issue happens on that machine. It may be a month or so before I can test this out.

I performed the changes to the Exploit protection settings as you’ve described. Indeed, there are six exceptions that I needed to create here as well.

Time will tell if that keeps the program from failing to “update” on launch, because we were not having that problem very often.

However, making those changes did not affect the sluggishness of the UI and the update rate of the tag displays. It still seems to update the various tag displays at about an 8 second interval. However, as usual, if I fire up Google Earth Pro, and let it run minimized, the tag display updates speed up to normal and the UI of the program itself also loses the sluggishness.

Things highlight fast, clicking menu items gets quick response, dragging windows around doesn’t happen in slow jerks (it’s nice and smooth), etc.

So there’s still something going on with this particular PC that seems to be display driver related, and which seems to require the “tickling” provided by having another program up and running.

Odd, indeed! :slight_smile:

The behavior is still the same on this system. It often fails to begin updating on launch, so you just have to close PAC Display Runtime, and then launch it again to get it to begin updating. And you must still have some other program running (even if minimized) for it to ever update on its own.

Once you get it to launch and update, and you have some other program running, it will run fine for days or weeks until the next time you need to launch it, and then you must go through this song and dance again to get it to run.

Had this exact some problem - very slow startup, especially as my supertrends began accumulating data. I was keeping a years worth of data for quite a few supertrends as the customer had requested that. So after a year of accumulation, the startup was taking on the order of 20-30 minutes before the Runtime would begin updating.
After close to a year of battling this, we finally figured out Windows Defender was the culprit. Upon startup Windows wants to scan all the project files that Runtime might be opening - including all supertrend historical data that apparently gets touched by PAC Display Runtime when it first starts. So we made exceptions for not only all Opto 22 program files, but also ALL of the project files as well. Startup is now the snappy result that I expect. I hope this helps.

That’s not really the same issue. In our case, the various windows either don’t update at all, or update very slowly (like once every 15 seconds). Creating exceptions for defender for all of the directories and their files didn’t make any difference.

The thing that makes the system run “fast” is running Google Earth at the same time (even though it’s minimized).

And we just re-launch runtime as many times as it takes to get it to start updating. Usually, it only takes a try or two.

Other than that, it all runs just great on this PC. I still think it may well be an incompatibility with the video drivers.

All of the operators have just gotten used to having to do this song and dance any time the system needs to be rebooted. :slight_smile:

Wow I am very grateful for this post! The issue occurred for me first while developing at home with a Win10 Home addition after one of the infamous automatic updates. I chalked it as being an issue with not having Win 10 Pro. Our Win10 Pro controls PC’s have the Win10 Automatic updates turned off thus this week when we proceeded to update the operating system, the exact same condition occurred. I am going to contact Opto support to see if they want to create a KB and possible change their install to modify the Win Security Exploit Settings for

A possible cause for this issue is the Windows “Processor power management” setting. Depending on the version of Windows, you might find it here:

Control Panel > Power Options > Change Plan Settings > Change advanced power settings > Processor power management.

Change the “Minimum processor state” to 100%

Change the “Maximum processor state” to 100%

You might check the other settings while you’re in that dialog so that you don’t have important things going to sleep or hibernating when nobody is interacting with the computer.

Have you had an issue with the processor state causing PAC Display issues? I haven’t heard this being an issue before. Be aware that a PC at 100% CPU will consume quite a bit more power and likely be noisy, so I wouldn’t run a machine like this unless it solves an issue. It may be worth a try in Sigmo’s issue though.

Thanks, Philip. I always appreciate your forum postings! Yes, we have had customers experience this issue, but you have a good point. Perhaps see if setting both to 100% solves the issue. If it does, then you know you’re on the right track. At that point, you can adjust the values and test the results to tune the settings for your specific needs.

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I was having the same problems as above and after about 8 months of stop start messing about I have also downloaded Google Earth and let it run in the background on the problematic machine.
All is now OK, PAC Runtime is running smoothly and quickly.
Google Earth did not install correctly as the machine has no internet connection but it installed enough to get the program itself running. Because Google Earth can’t connect to its servers it couldn’t show any graphics (maps of earth, etc) but it is still running in the background however.
My post from sometime ago is here…PACProject 10.1001 Build 24 issues

We’re still running Google Earth here. I and some operators have tried running other programs in the background to achieve the same effect, but none of them accomplish “the fix” the way Earth does!

I still feel like this is somehow display adapter related, but it could also be related to some power saving feature that I haven’t yet found.

I will try the tricks mentioned in some of the above posts, but I don’t want to force 100% CPU usage for a number of reasons. Backup power run time during a power failure being one concern, of course.

Everyone is just used to launching Google Earth before firing up Optodisplay Runtime. It’s not right, but it’s working.

Still, I’d really like to get to the bottom of it all and have this operate properly. We are running a dual NIC setup with the Opto system on one, and our office network on the other with separate subnets. While that’s not perfect security, at least the opto system is not directly exposed to the internet.

But this also means we can actually use Google Earth on this computer. The whole point of this PC and the 4K TV we’re using as a monitor is to have a large amount of real estate so we can display a lot of the plant’s data all at once. It’s quite convenient.

But this also makes for an impressive display for Google Earth and GIS data when we’re looking at pipe and valve locations throughout our distribution system. So Earth is a valuable tool for us at this workstation at times.


I ran into the tags not loading on startup in PAC Display at another customer site that has upgraded to Windows 10. I narrowed the Exploit Protection Setting down to needing to turn off Randomize memory allocation (Bottom-up ASLR).


How did you figure that one out? wow…
I have one of our first concrete batching plants now running on the EPIC.
Many a time on Display startup a lot of tags do not load until we restart Display runtime a few times.

Thanks - I’ll give this a shot!

It was happening consistently enough at the last site, that it was easy to narrow down the options in the EPS settings. I also don’t have much hair left.

Let us know how it goes.

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This has been my experience as well, except for needing google earth/some other program running. But initial launch after reboot is super unreliable and multiple launches are needed to get the display to work/update.

The thread has gotten long, so to consolidate what I changed:

Windows Security
App & Browser Control
Exploit Protection Settings
Program Settings
Add an exception for program name
Set overide to off on “Randomize memory allocation (Bottom-up ASLR)”

Or DisplayR.basic.exe if you are using Basic.


Thanks again phillip

None of the overrides to Windows Security did anything for our system. I performed all six, but to no avail.

So I’ve still been running Google Earth Pro in the background, and just launching PAC Display Basic over and over until it finally launches correctly. And while that is a pain, it’s been running fine once that song and dance was performed.

Now, after the most recent update to Windows 10 Pro, nothing makes it work. It takes an average of 16 seconds for each “pass” or “update” of the various indicators and charts.

At this point, replacing our “new” PC with a different new PC seems to be the only way we may get this all to work properly.

Edit to add:

I swiped a different PC from our office, and swapped it in for the one we were using. Unfortunately, it’s very similar to the one we were using. These are all HP Elitedesk systems. What we really need is a completely different PC, I think.

Nonetheless, it was running a different revision of Win 10, and although I did let it update itself, it seems to be working at least as well as our other one did before it updated. This “new” one is now running 10.0.18363.

I’m running Google Earth Pro in the background, and I’ve set all of the exceptions as well as setting windows security to ignore the three directories that hold our OptoDisplay projects, our OptoControl projects, and the one folder I created to hold various log files.

At some point, when the plant is not operating, I’ll try running it without Google Earth Pro running to see if it works properly without it.

Another update:

I wasn’t there, but overnight, Google Earth apparently crashed, and that made Optodisplay stop, as well.

Texting back and forth with the operator at the plant, I had him completely power the PC down, and power back up, at which point he tried to launch Earth, and it would not run, presenting him with an error, and eventually with a menu of things to try to “repair” it. At this point, he had Optodisplay Runtime running, and it was, again, running slowly.

When he finally got Earth to run, Optodisplay suddenly started updating fast again. So running Google Earth concurrently seems to be what is needed to “prod” the system into updating the display at a reasonable pace.

We aren’t getting display freezing but more of a snapshot in time. It is talking to the controllers fine. When we initially launch the display does not update. When we click on a different display it shows full failed state. If we go back to the home display the home display is at default state. When we click back to the previous different display it shows a snap shot in time of the data from that controllers.

Now get this: We have a flashing button when we click it. I can click it but the button doesn’t flash. If we switch to the home display and back the button is gone because it is in the flash off state. If we switch again the button reappears still in the flash state but in the show point. Its like we keep catching it in different points of the flash. All the data for our displays are like this. And the home display never updates to the accurate data.

We are runing PAC Pro 9.6 and can’t upgrade at this time. Controllers are on R9.5

More info here: PAC 9.6 Pro Display Runtime Not Updating

I had the same issue as @tmurray recently when working on a project where my customer is on 9.6. The 9.6 display would no longer update on my dev machine. The 9.6h patch from the ftp site fixed it as described in the linked thread.