Optimize the proposals loading performance #194

Job	Run time
Build test application / Build app	3m 54s
Tests (bundle exec parallel_test --type rspec --pattern spec/system --exclude-pattern spec/system... / Test app	10m 13s
Tests (bundle exec parallel_test --type rspec --pattern spec/ --exclude-pattern spec/system) / Test app	7m 9s
Tests (bundle exec parallel_test --type rspec --pattern spec/system/admin) / Test app	7m 1s
	28m 17s

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