Hey, thank you and everyone for trying to help, it is supprising to me how people from the internet can help you.

A bit history:

I am a new Mac user, I bought this used mac a few days ago, they upgrade to Sierra but the machine was not used so they did not give with this. So I think that downgrading could be a temporary fix for me too.

I did not delocalize it yet (Whatever this means, I'm gonna search it now on the internet and will come here with the results hehe)

This is the report from a software called EtreCheck.


EtreCheck version: 3.1.2 (334)
Report generated 2016-11-06 11:17:10
Download EtreCheck from https://etrecheck.com Runtime 24:48
Performance: Poor
Click the [Support] links for help with non-Apple products. Click the [Details] links for more information about that line.
Problem: Computer is too slow
Description:
I recently update to Sierra but it runs very slow from startup. The Mac takes too much time when the problem, followed some official guides but I could not find the problem yet. I removed the startup use none of this solutions seems to work
Hardware Information: i
MacBook Pro (15-inch, Early 2011)
[Technical Specifications] - [User Guide] - [Warranty & Service] MacBook Pro - model: MacBookPro8,2
1 2 GHz Intel Core i7 (i7-2635QM) CPU: 4-core
8 GB RAM Upgradeable - [Instructions]
BANK 0/DIMM0
4 GB DDR3 1333 MHz ok
BANK 1/DIMM0
4 GB DDR3 1333 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported Wireless: en1: 802.11 a/b/g/n
Battery: Health = Normal - Cycle count = 1
Video Information: i Intel HD Graphics 3000
Color LCD 1440 x 900
AMD Radeon HD 6490M - VRAM: 256 MB
System Software: i
macOS Sierra 10.12 (16A323) - Time since boot: less than an hour
Disk Information: i
WDC WD7500BPVT-75A1YT0 disk0 : (750,16 GB) (Rotational) [Show SMART report]


EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
OS (disk1) / [Startup]: 748.93 GB (733.00 GB free) Core Storage: disk0s2 749.30 GB Online
MATSHITADVD-R UJ-898 ()
USB Information: i
Apple Inc. FaceTime HD Camera (Built-in) Apple Inc. Apple Internal Keyboard / Trackpad Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller Apple Computer, Inc. IR Receiver
Thunderbolt Information: i Apple Inc. thunderbolt_bus
Gatekeeper: i
Mac App Store and identified developers
System Launch Agents: i [not loaded] 7 Apple tasks [loaded] 181 Apple tasks [running] 83 Apple tasks
System Launch Daemons: i [not loaded] 43 Apple tasks [loaded] 167 Apple tasks [running] 92 Apple tasks
Launch Daemons: i
[loaded] com.microsoft.office.licensing.helper.plist (2010-09-08) [Support]
User Login Items: i
iTunesHelper Aplicación (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app) smcFanControl copia Aplicación (/Applications/Utilities/smcFanControl copia.app)
Internet Plug-ins: i
SharePointBrowserPlugin: 14.0.0 (2010-09-08) [Support] QuickTime Plugin: 7.7.3 (2016-09-13)

3rd Party Preference Panes: i None
Time Machine: i
Time Machine not configured!
Top Processes by CPU: i 127% kernel_task
63% WindowServer
42% kextstat 11% hidd
4% Dock
Top Processes by Memory: i


591 MB 557 MB 401 MB 156 MB 147 MB
kernel_task com.apple.WebKit.WebContent mdworker(12)
Safari
UserEventAgent(2)


Virtual Memory Information: i
Self test - passed


1.87 GB
139 MB
6.13 GB
1.73 GB
0 B Swap Used


Diagnostics Information: i Nov 6, 2016, 10:32:22 AM


Available RAM Free RAM Used RAM Cached files



And this is the same report when runnig it on safe mode, a lot of difference:


EtreCheck version: 3.1.2 (334)
Report generated 2016-11-06 14:08:08
Download EtreCheck from https://etrecheck.com
Runtime 4:30
Performance: Good

Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.

Problem: Computer is too slow

Hardware Information: ⓘ
MacBook Pro (15-inch, Early 2011)
[Technical Specifications] - [User Guide] - [Warranty & Service]
MacBook Pro - model: MacBookPro8,2
1 2 GHz Intel Core i7 (i7-2635QM) CPU: 4-core
8 GB RAM Upgradeable - [Instructions]
BANK 0/DIMM0
4 GB DDR3 1333 MHz ok
BANK 1/DIMM0
4 GB DDR3 1333 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Battery: Health = Normal - Cycle count = 1

Video Information: ⓘ
Intel HD Graphics 3000
AMD Radeon HD 6490M - VRAM: 256 MB
Color LCD 1440 x 900

System Software: ⓘ
macOS Sierra 10.12 (16A323) - Time since boot: about 2 hours

Disk Information: ⓘ
WDC WD7500BPVT-75A1YT0 disk0 : (750,16 GB) (Rotational)
[Show SMART report]
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
OS (disk1) / [Startup]: 748.93 GB (733.01 GB free)
Core Storage: disk0s2 749.30 GB Online

MATSHITADVD-R UJ-898 ()

USB Information: ⓘ
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver

Thunderbolt Information: ⓘ
Apple Inc. thunderbolt_bus

Gatekeeper: ⓘ
Mac App Store and identified developers

System Launch Agents: ⓘ
[not loaded] 7 Apple tasks
[loaded] 181 Apple tasks
[running] 83 Apple tasks

System Launch Daemons: ⓘ
[failed] com.apple.ucupdate.plist (2016-09-13)
[failed] com.apple.watchdogd.plist (2016-09-13)
[not loaded] 43 Apple tasks
[loaded] 165 Apple tasks
[running] 92 Apple tasks

Launch Daemons: ⓘ
[not loaded] com.microsoft.office.licensing.helper.plist (2010-09-08) [Support]

User Login Items: ⓘ
iTunesHelper Aplicación (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
smcFanControl copia Aplicación (/Applications/Utilities/smcFanControl copia.app)

Internet Plug-ins: ⓘ
SharePointBrowserPlugin: 14.0.0 (2010-09-08) [Support]
QuickTime Plugin: 7.7.3 (2016-09-13)

3rd Party Preference Panes: ⓘ
None

Time Machine: ⓘ
Time Machine not configured!

Top Processes by CPU: ⓘ
3% ps
3% WindowServer
1% kernel_task
1% logd
1% fontd

Top Processes by Memory: ⓘ
507 MB kernel_task
147 MB UserEventAgent(2)
115 MB assistant_service
115 MB Finder
115 MB assistantd

Virtual Memory Information: ⓘ
3.05 GB Available RAM
1.55 GB Free RAM
4.95 GB Used RAM
1.51 GB Cached files
0 B Swap Used

Diagnostics Information: ⓘ
Nov 6, 2016, 11:26:58 AM Self test - passed