Wondering if someone could help me out, here. I just installed the game, and it seems to run pretty well despite the questionable specs of my system. There's only one big problem: when I click the mouse button to attack, my character does his attack animation, but the actual attack takes place a few seconds afterwards, i.e. I click, my wizard swings his wand, and a second or two afterward a bolt flies out.
I realize this sounds like connectivity issues, lag, etc. but: I haven't had a problem with other online games, and other functions (such as interacting with NPCs or moving items around my inventory) don't suffer the same problem. As I said, the game works otherwise smoothly. Here's an abbreviated version of my DX diag (yeah, I know my specs are a bit low, and that was a chance I decided to take because, hey, Diablo 3). I suspect there might be an issue with the video card. I was warned about that.
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System Information
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Time of this report: 4/6/2012, 07:39:39
Machine name: OWNER-VAIO
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.111118-2330)
Language: English (Regional Setting: English)
System Manufacturer: Sony Corporation
System Model: VPCCW17FX
BIOS: BIOS Date: 05/09/08 11:12:06 Ver: 08.00.10
Processor: Intel(R) Core(TM)2 Duo CPU T6600 @ 2.20GHz (2 CPUs), ~2.2GHz
Memory: 4096MB RAM
Available OS Memory: 4064MB RAM
Page File: 1420MB used, 6703MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode

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DxDiag Notes
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Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Input Tab: No problems found.

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DirectX Debug Levels
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Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)

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Display Devices
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Card name: NVIDIA GeForce G210M
Manufacturer: NVIDIA
Chip type: GeForce G210M
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0A74&SUBSYS_905E104D&REV_A2
Display Memory: 2014 MB
Dedicated Memory: 239 MB
Shared Memory: 1775 MB
Current Mode: 1366 x 768 (32 bit) (59Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: Nvidia Defaul
Monitor Id: SNY05FA
Native Mode: 1366 x 768(p) (59.940Hz)
Output Type: Internal
Driver Name: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Driver File Version: 8.16.0011.8783 (English)
Driver Version: 8.16.11.8783
DDI Version: 10.1
Driver Model: WDDM 1.1
Driver Attributes: Final Retail
Driver Date/Size: 4/1/2010 13:17:49, 9613416 bytes
WHQL Logo'd: n/a
WHQL Date Stamp: n/a
Device Identifier: {D7B71E3E-4934-11CF-B251-55B01DC2C535}
Vendor ID: 0x10DE
Device ID: 0x0A74
SubSys ID: 0x905E104D
Revision ID: 0x00A2
Driver Strong Name: oem23.inf:NVIDIA_SetA_Devices.NTamd64.6.1:Section044:8.16.11.8783:pci\ven_10de&dev_0a74&subsys_905e104d
Rank Of Driver: 00E60001