Websocket subscriptions improvements

[stefangutica]

Reasoning

Proposed Changes

How to test

[github-actions]

k6 load testing comparison.
Base Commit Hash: bdee2a0
Target Commit Hash: 642484b

Metric	Base				Target				Diff
	Avg	Max	90	95	Avg	Max	90	95	Avg	Max	90	95
Accounts	46.66	546.34	92.18	132.01	32.39	308.60	43.76	46.19	-30.57% ✅	-43.52% ✅	-52.52% ✅	-65.01% ✅
Blocks	67.58	1065.34	121.07	195.95	41.80	1002.75	52.45	59.97	-38.15% ✅	-5.87% ✅	-56.68% ✅	-69.40% ✅
Nodes	261.72	19806.11	152.66	185.33	32.55	446.55	43.78	46.13	-87.56% ✅	-97.75% ✅	-71.32% ✅	-75.11% ✅
Mex	47.22	1670.45	92.82	132.62	32.38	179.64	43.78	46.18	-31.43% ✅	-89.25% ✅	-52.84% ✅	-65.18% ✅
Pool	46.90	593.86	92.35	132.67	32.69	556.15	43.80	46.16	-30.30% ✅	-6.35% ✅	-52.57% ✅	-65.21% ✅
Transactions	80.36	6420.54	140.85	206.80	38.58	430.84	51.03	60.33	-51.99% ✅	-93.29% ✅	-63.77% ✅	-70.83% ✅
Tokens	80.27	1474.70	133.03	143.26	32.70	608.19	43.83	46.31	-59.27% ✅	-58.76% ✅	-67.05% ✅	-67.68% ✅
Test Run Duration	60002.02				60001.63

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