ZeroNet\core\tools\tor\tor.exe is using 20% of the CPU

### Step 1: Please describe your environment

* ZeroNet version: 0.6.2 rev3502
* Operating system: W10
* Web browser: FF beta
* Tor status: available
* Opened port: no
* Special configuration: --multiuser_local

### Step 2: Describe the problem:

Hello, it is not rare when i see the ZeroNet\core\tools\tor\tor.exe is using roughly 20% (it is sustaned usage for like 15 minutes i am watching the process) of the CPU in Task manager and System Explorer.

Connections (195, total made: 23784)

The normal Tor.exe process probably launched by Tor browser that i am also running is not using any CPU.

Computer is recovered from sleep mode, if it can play any role.

Similar amount of CPU (20%) is using Firefox and sometimes also qBittorrent. It is strange that just Tor would need that much. I seen connections of the process in /stats page and in System Explorer and it is not large amount. I am not browsing ZeroNet atm, i have 250 sites, maybe more in the list. ~126 connected on newsfeed.

After trying to restart the tor.exe it not started so i clicked to update Zeronet and after start the tor.exe is using like 5% of the CPU which is OK.

Start by reproducing the sustained CPU usage from ZeroNet\core\tools\tor\tor.exe on Windows 10, including after the computer resumes from sleep, and inspect the connections shown on the /stats page. Compare the process before and after restarting or updating ZeroNet; done means identifying and resolving the condition that causes the prolonged CPU usage.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.