Websocket subscriptions improvements

[stefangutica]

Reasoning

Proposed Changes

How to test

[github-actions]

k6 load testing comparison.
Base Commit Hash: aadda61
Target Commit Hash: f2d876a

Metric	Base				Target				Diff
	Avg	Max	90	95	Avg	Max	90	95	Avg	Max	90	95
Tokens	41.50	275.64	53.86	56.44	38.40	207.19	52.62	57.87	-7.47% ✅	-24.83% ✅	-2.31% ✅	+2.54% 🔴
Transactions	52.04	1887.10	55.07	57.53	71.80	14596.80	58.04	59.98	+37.96% 🔴	+673.50% 🔴	+5.39% 🔴	+4.25% 🔴
Nodes	41.50	275.60	53.82	56.41	60.07	15378.21	58.28	60.60	+44.74% 🔴	+5479.98% 🔴	+8.30% 🔴	+7.43% 🔴
Accounts	44.15	701.58	53.96	56.89	40.52	1046.91	54.01	58.45	-8.22% ✅	+49.22% 🔴	+0.10% 🔴	+2.74% 🔴
Mex	41.54	276.37	53.74	56.33	38.44	343.72	52.64	57.85	-7.46% ✅	+24.37% 🔴	-2.04% ✅	+2.70% 🔴
Pool	41.51	275.59	53.79	56.47	38.36	205.27	52.55	57.79	-7.59% ✅	-25.52% ✅	-2.31% ✅	+2.34% 🔴
Blocks	47.54	784.54	54.64	57.07	45.74	674.97	56.08	59.36	-3.79% ✅	-13.97% ✅	+2.64% 🔴	+4.02% 🔴
Test Run Duration	60004.66				60004.17

Legend: Avg - Average Response Time, Max - Maximum Response Time, 90 - 90th Percentile, 95 - 95th Percentile
All times are in milliseconds.