Autocad LT 2014 becomes slow after opening second dwg

[suzamata]

Autocad LT 2014 works fine when one dwg is open, but after opening a second dwg autocad becomes 'selectively sluggish'. By 'sluggish' I mean panning and zooming are choppy, and switching between paperspace layouts is painfully slow. By 'selective' I mean that the program is slow only when working on the second drawing; I can toggle over to the first dwg that was opened and normal functionality resumes. These are not big files, there are not underlays or xrefs or crazy hatches/dynamic blocks/etc. It happens when working locally or off of the file server.

The only way I can have two drawings open and work normally is to open two instances of Autocad LT 2014 and have a drawing open in each -- then, I can switch back and forth as usual, with normal speeds. Any ideas? 

[Charles_Shade]

Computer and Video card specs?

[braudpat]

Hello

Which PC ? Which Windows , How much memory ?

It could be the "famous" problem : AECCORE.CRX !?

Bye, Pat

[suzamata]

Windows XP Professional, running on Bootcamp / iMac

2 GB RAM

ATI Radeon HD 2600 XT - 256 MB

The "famous problem"? I'm intrigued. 

[Charles_Shade]

Nothing famous happening on a MAC machine.

You may be better served at the MAC for CAD Forum but I suspect that your RAM is woefully low for your software.

As well as the Video card, assuming it is an onboard card and not a dedicated card. 6+ Gig RAM and a 1 Gig video card would be a start.

[dgorsman]

If this is, in fact, running under Bootcamp and not VM, then it is running a full version of Windows and the Win version of LT, and this should be the first port o' call.

And second on the system specs.  Even under x32 XP 2 GB RAM is a little light.

[braudpat]

Hello Charles

He is running a real ACAD LT 2014 for Windows on a Boot Camp partition on the Mac 

with a Real Windows XP Pro etc ...

SO why it can't be the AECCORE.CRX problem !?

But I agree that 2 Gb for Windows XP Pro + ACAD LT 2014, it's a little bit LOW !!

Bye, Pat

[pendean]

Everyone, the OP is noting that running two sessions of AutoCAD LT2014 solved the problem. So RAM alone is not the issue.

[braudpat]

Hello Everyone

So I bet ONE Euro for the AECCORE.CRX problem !?

Bye, Pat

[suzamata]

I've been running older versions of AutoCAD LT on this machine (2008 iMac / Bootcamp / Windows XP Pro) for five years without a problem.

Pat: I read through the "flickering autocad lt 2014" http://forums.autodesk.com/t5/AutoCAD-LT-General/AutoCAD-LT-2014/td-p/3821690/page/3 thread since my problems are similar (lagging when two drawings are open, a flickering status area when switching layouts, etc.)   earlier and --just as an experiment--  tried changing AecCore.crx to AecCore.crx.old. I was unable to open AutoCAD after I changed the filename, so I had to change it back.  I know 2GB RAM is on the low side, but it does meet the minimum requirement specified by Autodesk for this version of LT. 

[braudpat]

Hello from France

So you have tried to REPLACE your standard 2014 AECCORE.CRX (32 bits) by the same file (but coming from ACAD LT 2013 32 bits) ... And it's NOT OK so I lost ONE Euro !

I was almost sure of my diagnostic : sniff, sniff !

Good Luck, Bye, Pat

[suzamata]

Bonjour Pat, 

No, I changed the filename only -- I saw that for some users that worked, while others had to swap the file out with a 2013 version. Or maybe I misunderstood altogether -- anyway, I don't have a 2013 version to copy in, so your theory will have to remain untested for me. 

[pendean]

In the link you provided, replies 40-43 discuss a successful Windows Registry edit: noguarantee it will work so bakc up the REgistry and now how to restore it before you do so.

>>>...I've been running older versions of AutoCAD LT on this machine ...<<<
That's no guarantee newer versions will be trouble-free.

[suzamata]

Just to update: I finally got fed up this morning with this issue (slow to zoom, pan, and switch layouts when two or more drawings are open) and tried Pat's suggestion again. I changed the AecCore.crx file located in 2014 LT to "AecCore.crx.old" and copied in the "AecCore.crx" file from True View 2013.

So far, it has solved the problem, although I realize it may cause other unforeseen issues.

[jaco]

I have similar issues.

Win 7, Core i7 3.2Ghz, 16GB RAM and a Quadro 1800. Latest drivers and BIOS. All service Packs Installed.

When opening a second DWG it bulks down and also has that flickering notification area.

I am going to try this.

Funny thing is, I have 8 similar PC's and only this one has this problem.

[jaco]

Okay it does work when you rename it.

We will see if there is any side effects to this.

[Charles_Shade]

---

@Anonymous wrote:
I have similar issues.

Funny thing is, I have 8 similar PC's and only this one has this problem.

---

And that is likely why Autodesk has not offered a fix for this.

What is the one thing that is wrong with the one PC?

[jaco]

As mentioned throughout the feed. Opening a second DWG makes it hard to work due to slow response time, zooming, panning. And there seem to be a flickering at the bottom right by the notification area.

Renaming the AecCore.crx file seems to fix it. Non of the other PC's running CAD LT 2014 has these simptoms.

[Charles_Shade]

I meant that as a rhetorical question. Autodesk cannot fix one pc out of dozens; they have to think about the dozens.

[jaco]

Oh. Yeah sorry.