Hello Eric,
I decided to completely reinstall the operating system because it was slowing down. I deleted the partition with Partition Manager and reinstalled the macOS. Immediately after completion I started using Safari without installing any third party applications. And the major problem got WORSE as now when the problem appears I have to quit Safari completely. The tabs become completely inactive and stop working, although all other functions seem to work. This seems to only happen after I have watched the show half way through.
Thanks in advance

EtreCheck version: 4.1 (4A162)
Report generated: 2018-03-05 17:31:50
Download EtreCheck from https://etrecheck.com
Runtime: 3:23
Performance: Good
Problem: Other problem
Major Issues:
Anything that appears on this list needs immediate attention.
(The issue is present even when SIP is enabled)
No Time Machine backup - Time Machine backup not found.
System Integrity Protection disabled - System Integrity Protection is disabled. This computer is at risk of malware infection.
Minor Issues:
These issues do not need immediate attention but they may indicate future problems.
32-bit Apps - This machine has 32-bits apps that may have problems in the future.
Hardware Information:
MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports)
MacBook Pro Model: MacBookPro13,2
1 2.9 GHz Intel Core i5 (i5-6267U) CPU: 2-core
16 RAM Not upgradeable
BANK 0/DIMM0
8 GB LPDDR3 2133 ok
BANK 1/DIMM0
8 GB LPDDR3 2133 ok
Battery: Health = Normal - Cycle count = 269
Video Information:
Intel Iris Graphics 550 - VRAM: 1536 MB
Color LCD 2880 x 1800
Drives:
disk0 - APPLE SSD AP0512J 500.28 GB (Solid State - TRIM: Yes)
Internal PCI-Express 8.0 GT/s x4 NVM Express
disk0s1 - EFI [EFI] 315 MB
disk0s2 499.96 GB
disk1s1 - M***********D (APFS) 499.96 GB 13.84 GB
disk1s2 - Preboot (APFS) [APFS Preboot] 499.96 GB 41 MB
disk1s3 - Recovery (APFS) [Recovery] 499.96 GB 1.02 GB
disk1s4 - VM (APFS) [APFS VM] 499.96 GB 1.07 GB
Mounted Volumes:
disk1s1 - M***********D 499.96 GB (483.83 GB free)
APFS
Mount point: /
Encrypted
disk1s4 - VM [APFS VM] 499.96 GB (483.83 GB free)
APFS
Mount point: /private/var/vm
Network:
Interface en0: Wi-Fi
802.11 a/b/g/n/ac
One IPv4 address
Interface en6: Bluetooth PAN
Interface bridge0: Thunderbolt Bridge
iCloud Quota: 2.47 GB available
System Software:
macOS High Sierra 10.13.3 (17D47)
Time since boot: About 4 hours
System Load: 2.09 (1 min ago) 1.88 (5 min ago) 1.75 (15 min ago)
Security:
| System | Status |
|---|
| Gatekeeper | Mac App Store and identified developers |
| System Integrity Protection | disabled |
32-bit Applications:
| Name | Version |
| quicklookd32 | 5.0 |
| DVD Player | 5.8 |
| InkServer | 10.9 |
System Launch Agents:
| [Not Loaded] | 8 Apple tasks |
| [Loaded] | 156 Apple tasks |
| [Running] | 126 Apple tasks |
System Launch Daemons:
| [Not Loaded] | 40 Apple tasks |
| [Loaded] | 164 Apple tasks |
| [Running] | 127 Apple tasks |
User Login Items:
iTunesHelper Application (Apple, Inc. - installed 2018-03-05)
(/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins:
QuickTime Plugin: 7.7.3 (installed 2018-01-19)
Safari Extensions:
Time Machine:
Time Machine Not Configured!
Top Processes by CPU:
| Process (count) | Source | % of CPU |
| TouchBarServer | Apple | 15 |
| System Preferences | Apple | 12 |
| kernel_task | Apple | 9 |
| WindowServer | Apple | 9 |
| hidd | Apple | 6 |
Top Processes by Memory:
| Process (count) | Source | RAM usage |
| kernel_task | Apple | 1.19 GB |
| Safari | Apple | 447 MB |
| MTLCompilerService (16) | Apple | 422 MB |
| com.apple.WebKit.WebContent (2) | Apple | 356 MB |
| cloudphotosd | Apple | 150 MB |
Top Processes by Network Use:
| Process | Source | Input | Output |
| mDNSResponder | Apple | 5 MB | 122 KB |
| EmbeddedOSInstallService | Apple | 157 KB | 215 KB |
| biometrickitd | Apple | 249 KB | 78 KB |
| apsd | Apple | 59 KB | 60 KB |
| netbiosd | Apple | 24 KB | 5 KB |
Top Processes by Energy Use:
| Process (count) | Source | Energy usage (0-100) |
| System Preferences | Apple | 6 |
| TouchBarServer | Apple | 4 |
| WindowServer | Apple | 2 |
| hidd | Apple | 1 |
| com.apple.WebKit.WebContent (2) | Apple | 0 |
Virtual Memory Information:
| Available RAM | 9.59 GB |
| Free RAM | 35 MB |
| Used RAM | 6.41 GB |
| Cached files | 9.56 GB |
| Swap Used | 0 B |
End of report