StarCraft® II

27" iMac experiencing intermittent lag

I've been experiencing sporadic lag when playing starcraft 2 in multiplayer and campaign. I have 27" iMac i5 with Radeon 5750 and 4gb of RAM.

I've found that randomly the game will start stuttering/lagging causing the game to become basically unplayable. The lag will happen for 1 second where the game kinda pauses and occurs every 10 seconds or so. I've tried many different options to fix it including lowering framerate cap to 50, lowering resolution to 1600x890, setting graphic settings to medium/low and it still happens.

I know that this is not a network issue as my pings are very low and I'm not on wifi. It also shouldn't be that my computer can't handle the graphics because I remember that when SC2 was first released I played with graphic settings on high with no issues whatsoever. Has anyone out there been experiencing this issue or have a fix for it? It's really frustrating not being able to play this game smoothly.
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hey I'm having a similar problem as you and so are some other people. they are not responding to this problem so far. hopefully you get a reply because it's very annoying
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do you have links to other threads where they discuss this issue?
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I have same issue, somehow at the beginning I thought that SCII HOTS was running better than WoL, but then I played a single 2v2 mp, and OMG!, it was sooooo laggy.. frame rates sometimes on 7-15 fps... and my iMac is i7 27'' 12 GB ram same graphic card as yours. Settings on high shaders on low as well as shadows and resolution was something 1900....X something.
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Support Forum Agent
Are you able to post your system specs? This will help us see what system you're running.

    1. Launch StarCraft II.
    2. Put StarCraft II into Windowed Mode if it is not already in Windowed Mode.
    3. From the system menu bar, select Help > Copy Support Information: http://oi47.tinypic.com/imt0yx.jpg
    4. Paste the contents of the copied system information here (Command-V)
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OMG GLAD THAT I AM NOT ALONE!!! ever since the debut of HoTs this happened to me everyday, its getting to the point where I'm not playing HoTs anymore haha, anyways, ill definitely do that later when i come home tonight, thanks machkhan!
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Software:

System Software Overview:

System Version: Mac OS X 10.7.2 (11C74)
Kernel Version: Darwin 11.2.0
64-bit Kernel and Extensions: Yes
Time since boot: 11 minutes

Hardware:

Hardware Overview:

Model Name: MacBook Pro
Model Identifier: MacBookPro8,2
Processor Name: Intel Core i7
Processor Speed: 2.4 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 8 GB
Boot ROM Version: MBP81.0047.B26
SMC Version (system): 1.69f3
Sudden Motion Sensor:
State: Enabled

Graphics/Displays:

AMD Radeon HD 6770M:

Chipset Model: AMD Radeon HD 6770M
Type: GPU
Bus: PCIe
PCIe Lane Width: x8
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x6740
Revision ID: 0x0000
ROM Revision: 113-C0170L-573
gMux Version: 1.9.23
EFI Driver Version: 01.00.573
Displays:
Color LCD:
Resolution: 1440 x 900
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
SyncMaster:
Resolution: 1920 x 1080 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Display Serial Number: HVGS600134
Mirror: Off
Online: Yes
Rotation: Supported
Adapter Type: Apple Mini DisplayPort To VGA Adapter
Adapter Firmware Version: 1.03

Intel HD Graphics 3000:

Chipset Model: Intel HD Graphics 3000
Type: GPU
Bus: Built-In
VRAM (Total): 512 MB
Vendor: Intel (0x8086)
Device ID: 0x0126
Revision ID: 0x0009
gMux Version: 1.9.23

Other:

Input Source ID: com.apple.keylayout.Australian
Keyboard Layout: ANSI
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i forgot to say, for me, starcraft 2 originally ran smoothly at 60FPS at medium graphics were fine! now i keep getting network/stalls and the other stall i forgot whats it called every 30seconds- 5minutes randomly...its quite annoying during gameplay...
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Software:

System Software Overview:

System Version: OS X 10.8.3 (12D78)
Kernel Version: Darwin 12.3.0
Time since boot: 1 day5:19

Hardware:

Hardware Overview:

Model Name: iMac
Model Identifier: iMac11,3
Processor Name: Intel Core i7
Processor Speed: 2.93 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Memory: 12 GB
Processor Interconnect Speed: 4.8 GT/s
Boot ROM Version: IM112.0057.B00
SMC Version (system): 1.59f2

Graphics/Displays:

ATI Radeon HD 5750:

Chipset Model: ATI Radeon HD 5750
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x68a1
Revision ID: 0x0000
ROM Revision: 113-B9710C-238
EFI Driver Version: 01.00.417
Displays:
iMac:
Display Type: LCD
Resolution: 2560 x 1440
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Connection Type: DisplayPort

Other:

Input Source ID: com.apple.keylayout.US
Keyboard Layout: ISO
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Support Forum Agent
@WHYREETO

System Version: Mac OS X 10.7.2 (11C74)

You should update to 10.7.5 first to see if newer drivers and OS updates help. Our games are intended to run on the latest builds of supported OS'.

Try using a combo update: http://support.apple.com/kb/dl1582

@GustavPicora
Is this only in multiplayer mode or all modes?
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I have updated to the most recent OS X Lion software but this issue still happens randomly. One day I'll be playing and everything will be smooth and then maybe like an hour in everything will become extremely laggy and unplayable. On another day it'll be laggy from the very beginning and the first game.

I don't feel like it is a hardware issue because I can run the game with 40-60 fps on high settings and high resolution when it is running normally but sometimes when I run it on low settings and low resolution it still lags.

Right now, I play on medium to low settings with around 1600x900 resolution (can't remember the exact numbers) and have frame rate capped at 50. I know the 27" iMac with radeon 5750 is more than capable of handling higher graphic settings so it seems to be a software issue...
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My computer is very similar to those described above (27' iMac, OSX 10.7.5, 3.06 GHz Intel Core Duo, 4 GB 1067 MHz RAM), totally updated, and I am having the exact same issue, that being random spurts of lag that sometimes drop me from games. Like others have said, it does not seem to be a hardware issue, as there are times the game sound will hit a bump and repeat for minutes on end before any actual gameplay lag sets in. Furthermore, the lag sets in with no discernible trigger other than the sound loop; high army count battles in 4v4's do not cause me to drop any more than early game in 1v1.

This happened to me in campaign a few times as well, even while playing in offline mode.
It happens enough to make playing anything seriously rather frustrating, so a solution would be very much appreciated.
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@Machkhan

Its mostly in MP, but on the other modes there are spikes as well, fluctuating between 25-35 fps in dense areas.
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Yup, I can confirm this is stil a problem too. It's been happening since release of WoL (or very close). There's no permanent fix, you just hope that it isn't going to happen when you join a game, or you install windows/bootcamp and play the windows version.

Sometimes sleeping/waking your mac can help and rebooting almost always helps. But don't expect a fix anytime soon.

I've had this since 10.6 though...its affected every version of OS X and two of my 3 macs that i've owned (2011 and 2012 imacs, 2009 macbook pro not as much)
Edited by smb on 3/23/2013 12:21 PM PDT
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my specs, on the off-chance theyll help anyone – basically fully loaded 2012 imac with 32gb of ram and 3tb fusion drive:

Model Name: iMac
Model Identifier: iMac13,2
Processor Name: Intel Core i7
Processor Speed: 3.4 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Memory: 32 GB
Boot ROM Version: IM131.010A.B04
SMC Version (system): 2.11f14

System Software Overview:

System Version: OS X 10.8.3 (12D78)
Kernel Version: Darwin 12.3.0
Boot Volume: Macintosh HD
Boot Mode: Normal
Computer Name: ********** iMac
User Name: *********** (***********)
Secure Virtual Memory: Enabled
Time since boot: 8 days 14:37

Chipset Model: NVIDIA GeForce GTX 680MX
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 2048 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x11a3
Revision ID: 0x00a2
ROM Revision: 3707
Displays:
iMac:
Display Type: LCD
Resolution: 2560 x 1440
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Connection Type: DisplayPort

APPLE SSD SM128E:

Capacity: 121.33 GB (121,332,826,112 bytes)
Model: APPLE SSD SM128E
Revision: CXM09A1Q
Serial Number: x
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk1
Medium Type: Solid State
TRIM Support: Yes
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified
Volumes:
disk1s1:
Capacity: 209.7 MB (209,715,200 bytes)
BSD Name: disk1s1
Content: EFI
disk1s2:
Capacity: 120.99 GB (120,988,852,224 bytes)
BSD Name: disk1s2
Content: Apple_CoreStorage
Boot OS X:
Capacity: 134.2 MB (134,217,728 bytes)
BSD Name: disk1s3
Content: Apple_Boot

APPLE HDD ST3000DM001:

Capacity: 3 TB (3,000,592,982,016 bytes)
Model: APPLE HDD ST3000DM001
Revision: AP15
Serial Number: x
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Rotational Rate: 7200
Medium Type: Rotational
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified
Volumes:
disk0s1:
Capacity: 209.7 MB (209,715,200 bytes)
BSD Name: disk0s1
Content: EFI
disk0s2:
Capacity: 3 TB (2,999,733,223,424 bytes)
BSD Name: disk0s2
Content: Apple_CoreStorage
Recovery HD:
Capacity: 650 MB (650,002,432 bytes)
BSD Name: disk0s3
Content: Apple_Boot
Edited by smb on 3/23/2013 12:33 PM PDT
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Same problem as well

mid 2010 iMac 27"
2.8 GHz Intel Core i5
4 GB
ATI Radeon 5750 OSX 10.8.3.

Hey PwnyExpress, did any of these suggestions / lowering the resolution help?
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Same here, since HOTS cant play on anything but lowest settings... awful, had everything maxed in WOL

3.4 i7
16 gb ram
Radeon 6970M 2048mb
latest mountain lion
SSD
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same here.
after the 2.0.10 patch, my FPS is around 5.
all my video settings are in low. and my resolution is 1280x700.
before that patch, i was playing everyday without any problems, my fps was around 50-60.
now it is maximum 8. i can't even move the mouse.
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This has been happening for literally years, since summer 2011 at least.

I wouldn't ever expect it to be fixed. Best you can do is sleep/wake or reboot and hope that it helps.
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