Judging from your earlier reply, you have discovered ( Well Done on your part 👍) that mixing Syncing the Notes Application with more than one source can be problematic at best and frustrating.
Would suggest you have possibly Solved the issue yourself 😀. Use only one source to sync your Notes.
The analysis below is possible irrelevant at this point but at the sometime worth considering some actions.
Problem: Computer is too slow
Description: the notes application keeps creating a new note upon opening also slow whilst gaming.
Major Issues:
Q - Security updates disabled - Security updates are disabled. This computer is at risk of malware infection.
A - Personal choice
Q - MacBook Pro (Retina, 13-inch, Early 2015)
Q - disk0 - APPLE SSD SM0256G 251.00 GB (Solid State - TRIM: Yes)
Q - Kernel panics - This system has experienced kernel panics. This could be a sign of hardware failure.
A - This one is worthy of some serious considerations. The Machine is from 2015 in 2022 and SSD Drives do have a life span before it will start to indicate possible failures. That maybe worth considering a visit to an Apple Authorized Service Centre for evaluation
Q - Apple security disabled - Apple security software is disabled. This computer is at risk of malware infection.
A - Personal choice
Minor Issues:
Q - High battery cycle count - Your battery may be losing capacity.
Q - Battery: Health = Normal - Cycle count = 731
A - Batteries are consumable product and they too have a life span before needing replacements. Apple Batteries are rated for 1000 Full Battery Cycles or 80% Capacity before needing replacements
Unsigned Files:
Q - Plugin: /Library/Internet Plug-Ins/Silverlight.plugin
A - Obsolete and needs to be removed
User Login Items:
Q - [Not Loaded] AdGuard Login Helper (App Store - installed 2022-08-08)
/Applications/added/AdGuard for Safari.app/Contents/Library/LoginItems/AdGuard Login Helper.app
A - Will contribute to Issues including excess Resource, CPU and memory usages .
Any Third Party Applications that will interfere with the normal operation of the OS, is an invitation for disaster and comprising the Operating System
Certain Applications maybe available on the Apple Apps Store - this only means the Developer is prepared to pay Apple a portion on each sale. What the Application may do to the computer is up to the User to check this out before purchase
Any of the below should be removed as per Developers Instructions
Ad Guard
Internet Plug-ins:
Q 1 - Silverlight: 5.1.50901.0 (? - installed 2017-11-09)
Q 2 - iPhotoPhotocast: 7.0 (Apple - installed 2010-05-20)
Q 3 - CANONiMAGEGATEWAYDL: 3.1.0.2 (? - installed 2009-09-09)
Q 4 - o1dbrowserplugin: 5.41.3.0 (? - installed 2016-01-03)
User Internet Plug-ins:
Q 5 - ZoomUsPlugIn: 4.0.29656.0413 (? - installed 2017-05-31)
A1 to A5 - Outdated and either need to be remove or more Current versions installed
Q - 2022-08-05 08:17:55 Kernel Panic
A - Dovetails into the Age of the computer, SSD and Battery