Improve performance of NT client

[Gold872]

Resolves #350

[codecov]

Codecov Report

❌ Patch coverage is 72.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.64%. Comparing base (03340ba) to head (2443c81).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
lib/services/nt4_client.dart	72.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #351      +/-   ##
==========================================
+ Coverage   78.55%   78.64%   +0.09%     
==========================================
  Files          95       95              
  Lines        9595     9598       +3     
==========================================
+ Hits         7537     7548      +11     
+ Misses       2058     2050       -8     

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