Allora,
ho fatto il reset della PRAM e SMC. Il mio problema persiste. Per completezza d'informazioni qui di seguito ci sono i risultati del check tramite Etrecheck:
EtreCheck version: 2.4.2 (142)
Report generated 9/28/15, 8:31 PM
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Click the [Click for details] links for more information about that line.
Hardware Information: (What does this mean?)
iMac (21.5-inch, Mid 2011) (Technical Specifications)
iMac - model: iMac12,1
1 2.5 GHz Intel Core i5 CPU: 4-core
16 GB RAM Upgradeable
BANK 0/DIMM0
Empty
BANK 1/DIMM0
Empty
BANK 0/DIMM1
8 GB DDR3 1333 MHz ok
BANK 1/DIMM1
8 GB DDR3 1333 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: (What does this mean?)
AMD Radeon HD 6750M - VRAM: 512 MB
iMac 1920 x 1080
System Software: (What does this mean?)
OS X 10.10.5 (14F27) - Time since boot: about one hour
Disk Information: (What does this mean?)
ST3500418AS disk1 : (500,11 GB) (Rotational)
EFI (disk1s1) <not mounted> : 210 MB
HDD Archivio Interno (disk1s2) /Volumes/HDD Archivio Interno : 422.00 GB (369.87 GB free)
BOOTCAMP (disk1s3) /Volumes/BOOTCAMP : 77.25 GB (962 MB free)
OCZ-VERTEX460A disk0 : (240,06 GB) (Solid State - TRIM: Yes)
EFI (disk0s1) <not mounted> : 210 MB
SSD (disk0s2) / : 239.20 GB (226.24 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information: (What does this mean?)
Apple Inc. FaceTime HD Camera (Built-in)
Western Digital Ext HDD 1021 2 TB
EFI (disk2s1) <not mounted> : 210 MB
ELEMENTS (disk2s2) /Volumes/ELEMENTS : 2.00 TB (1.71 TB free)
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple, Inc. Keyboard Hub
Apple Inc. Apple Keyboard
Microsoft Microsoft® 2.4GHz Transceiver v8.0
Apple Internal Memory Card Reader
Apple Computer, Inc. IR Receiver
Thunderbolt Information: (What does this mean?)
Apple Inc. thunderbolt_bus
Configuration files: (What does this mean?)
/etc/sudoers, File size 2299 but expected 1275
Gatekeeper: (What does this mean?)
Mac App Store and identified developers
Problem System Launch Daemons: (What does this mean?)
failed com.apple.Kerberos.digest-service.plist [Click for details]
Launch Daemons: (What does this mean?)
[loaded] com.macpaw.CleanMyMac3.Agent.plist [Click for support]
User Launch Agents: (What does this mean?)
[running] com.akamai.single-user-client.plist [Click for support]
[loaded] com.macpaw.CleanMyMac3.Scheduler.plist [Click for support]
User Login Items: (What does this mean?)
CleanMyMac 3 Menu Applicazione (/Applications/CleanMyMac 3.app/Contents/MacOS/CleanMyMac 3 Menu.app)
Internet Plug-ins: (What does this mean?)
Default Browser: Version: 600 - SDK 10.10
QuickTime Plugin: Version: 7.7.3
3rd Party Preference Panes: (What does this mean?)
Akamai NetSession Preferences [Click for support]
Time Machine: (What does this mean?)
Time Machine not configured!
Top Processes by CPU: (What does this mean?)
67% com.apple.WebKit.WebContent(2)
10% netsession_mac
9% dndlauncher
7% WindowServer
4% Safari
Top Processes by Memory: (What does this mean?)
1.01 GB kernel_task
295 MB com.apple.WebKit.WebContent(2)
197 MB iconservicesagent(2)
180 MB mds_stores
180 MB Safari
Virtual Memory Information: (What does this mean?)
9.70 GB Free RAM
6.30 GB Used RAM (3.77 GB Cached)
0 B Swap Used
Diagnostics Information: (What does this mean?)
Sep 28, 2015, 07:23:52 PM Self test - passed
Continuo ad avere basso fps durante gioco.
Spero possiate aiutarmi. Grazie mille ancora per i suggerimenti dati e quelli che verrano.