What changes have you made to the system?

As well, please include information as requested at https://github.com/ValveSoftware/steam-for-linux/

Basically I have done none changes. The computer hardware is the same. I have had made few linux mint reinstalls, because I had problem installing ati. I have noticed that it doesn't install with all kernels. The default seems to work. The interface of steam is very laggy. I have no idea why. Steam randomly crashes now, haven't done that before. One error has been on the line 72. I don't remember the file, but it's common error on the steam. I have added the -nojoy parameter and taken away friends community...

Processor Information:
Vendor: AuthenticAMD
Speed: 3712 Mhz
4 logical processors
4 physical processors
HyperThreading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Supported
SSE41: Unsupported
SSE42: Unsupported

Network Information:
Network Speed:

Operating System Version:
Linux Mint 14 Nadia (32 bit)
Kernel Name: Linux
Kernel Version: 3.5.0-17-generic
X Server vendor: The X.Org Foundation
X Server release: 11300000

Video Card:
Driver: ATI Technologies Inc. AMD Radeon HD 7700 Series

Driver Version:  4.2.11903 Compatibility Profile Context
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 29 Hz
VendorID:  0x1002
DeviceID:  0x683d
Number of Monitors:  2
Number of Logical Video Cards:  1
Primary Display Resolution:  1920 x 1080
Desktop Resolution: 1920 x 1080
Primary Display Size: 0.63" x 0.35"  (0.71" diag)
                                        1.6cm x 0.9cm  (1.8cm diag)
Primary VRAM Not Detected

Sound card:
Audio device: Realtek ALC887-VD

Memory:
RAM: 8010 Mb

Miscellaneous:
UI Language: English
LANG: en_US.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 271118 Mb
Largest Free Hard Disk Block: 242662 Mb

Installed software:

Recent Failure Reports:

GL_NVX_gpu_memory_info: UNAVAILABLE
GL_ATI_meminfo: AVAILABLE
GL_ATI_meminfo: GL_TEXTURE_FREE_MEMORY_ATI: Total Free: 808931, Largest Avail: 726672, Total Aux: 1594362, Largest Aux Avail: 2223
GL_MAX_SAMPLES_EXT: 8
[1227/223757:ERROR:resource_bundle.cc(411)] Failed to load /home/j.local/share/Steam/SteamApps/fiTeam Fortress 2 Beta/cef_gtk.pak
Some features may not be available.
[1227/223757:WARNING:proxy_service.cc(646)] PAC support disabled because there is no system implementation
CShaderDeviceMgrBase::GetRecommendedConfigurationInfo: CPU speed: 3712 MHz, Processor: AuthenticAMD
GlobalMemoryStatus: 4294967295
CShaderDeviceMgrBase::GetRecommendedConfigurationInfo: CPU speed: 3712 MHz, Processor: AuthenticAMD
GlobalMemoryStatus: 4294967295
IDirect3DDevice9::Create: BackBufWidth: 1920, BackBufHeight: 1080, D3DFMT: 3, BackBufCount: 1, MultisampleType: 0, MultisampleQuality: 0
/home/j.l/ocal/share/Steam/SteamApps/f971/Team Fortress 2 Beta/hl2.sh: line 72: 10163 Segmentation fault ${GAME_DEBUGGER} "${GAMEROOT}"/${GAMEEXE} "$@"
Game removed: AppID 520 "Team Fortress 2 Beta", ProcID 10163
saving roaming config store to 'sharedconfig.vdf'
roaming config store 2 saved successfully

There is several issues with AMD Catalyst and the Steam client: https://github.com/ValveSoftware/steam-for-linux/issues/429.

It is recommended to use XRender for KDE desktop effects, however I noticed that using XRender makes the steam client very unresponsive with my setup (old fglrx driver 12.10 from kubuntu 12.10 repositories). Since switching to OpenGL desktop effects, the client is pretty responsive with my hardware.

Maybe this change could help you too? See #594 for details.

NO