Same here, on OSX Big Sur 11.3
Before the update to Big Sur system startup and application startup was normal.
Model Name: MacBook Pro
Model Identifier: MacBookPro11,5
Processor Name: Quad-Core Intel Core i7
Processor Speed: 2,5 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Hyper-Threading Technology: Enabled
Memory: 16 GB
System Firmware Version: 427.0.0.0.0
SMC Version (system): 2.30f2
mangelajo
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