diff --git a/lib/datadog/appsec/configuration/settings.rb b/lib/datadog/appsec/configuration/settings.rb
index fd95b1f72bd..ccd3b0e67df 100644
--- a/lib/datadog/appsec/configuration/settings.rb
+++ b/lib/datadog/appsec/configuration/settings.rb
@@ -55,27 +55,23 @@ def self.add_settings!(base)
 
               option :ruleset do |o|
                 o.env_var 'DD_APPSEC_RULES'
-                o.default { DEFAULT_APPSEC_RULESET }
-                o.lazy
+                o.default DEFAULT_APPSEC_RULESET
               end
 
               option :ip_denylist do |o|
-                o.default { [] }
-                o.lazy
+                o.default []
               end
 
               option :user_id_denylist do |o|
-                o.default { [] }
-                o.lazy
+                o.default []
               end
 
               option :waf_timeout do |o|
                 o.env_var 'DD_APPSEC_WAF_TIMEOUT'
-                o.default { DEFAULT_APPSEC_WAF_TIMEOUT } # us
+                o.default DEFAULT_APPSEC_WAF_TIMEOUT # us
                 o.setter do |v|
                   Datadog::Core::Utils::Duration.call(v.to_s, base: :us)
                 end
-                o.lazy
               end
 
               option :waf_debug do |o|
@@ -96,20 +92,18 @@ def self.add_settings!(base)
 
               option :obfuscator_key_regex do |o|
                 o.env_var 'DD_APPSEC_OBFUSCATION_PARAMETER_KEY_REGEXP'
-                o.default { DEFAULT_OBFUSCATOR_KEY_REGEX }
-                o.lazy
+                o.default  DEFAULT_OBFUSCATOR_KEY_REGEX
               end
 
               option :obfuscator_value_regex do |o|
                 o.env_var 'DD_APPSEC_OBFUSCATION_PARAMETER_VALUE_REGEXP'
-                o.default { DEFAULT_OBFUSCATOR_VALUE_REGEX }
-                o.lazy
+                o.default  DEFAULT_OBFUSCATOR_VALUE_REGEX
               end
 
               settings :track_user_events do
                 option :enabled do |o|
                   o.env_var 'DD_APPSEC_AUTOMATED_USER_EVENTS_TRACKING'
-                  o.default { DEFAULT_APPSEC_AUTOMATED_TRACK_USER_EVENTS_ENABLED }
+                  o.default  DEFAULT_APPSEC_AUTOMATED_TRACK_USER_EVENTS_ENABLED
                   o.setter do |v|
                     if v
                       v.to_s != 'disabled'
@@ -117,12 +111,11 @@ def self.add_settings!(base)
                       false
                     end
                   end
-                  o.lazy
                 end
 
                 option :mode do |o|
                   o.env_var 'DD_APPSEC_AUTOMATED_USER_EVENTS_TRACKING'
-                  o.default { DEFAULT_APPSEC_AUTOMATED_TRACK_USER_EVENTS_MODE }
+                  o.default  DEFAULT_APPSEC_AUTOMATED_TRACK_USER_EVENTS_MODE
                   o.setter do |v|
                     string_value = v.to_s
                     if APPSEC_VALID_TRACK_USER_EVENTS_MODE.include?(string_value)
@@ -136,7 +129,6 @@ def self.add_settings!(base)
                       DEFAULT_APPSEC_AUTOMATED_TRACK_USER_EVENTS_MODE
                     end
                   end
-                  o.lazy
                 end
               end
             end
diff --git a/lib/datadog/ci/configuration/settings.rb b/lib/datadog/ci/configuration/settings.rb
index 16681cdbd01..e0dfdf42e71 100644
--- a/lib/datadog/ci/configuration/settings.rb
+++ b/lib/datadog/ci/configuration/settings.rb
@@ -38,14 +38,10 @@ def self.add_settings!(base)
               # TODO: Deprecate in the next major version, as `instrument` better describes this method's purpose
               alias_method :use, :instrument
 
-              option :trace_flush do |o|
-                o.default { nil }
-                o.lazy
-              end
+              option :trace_flush
 
               option :writer_options do |o|
-                o.default { {} }
-                o.lazy
+                o.default {}
               end
             end
           end
diff --git a/lib/datadog/ci/contrib/cucumber/configuration/settings.rb b/lib/datadog/ci/contrib/cucumber/configuration/settings.rb
index 854fb33d054..e16c44dcff9 100644
--- a/lib/datadog/ci/contrib/cucumber/configuration/settings.rb
+++ b/lib/datadog/ci/contrib/cucumber/configuration/settings.rb
@@ -21,7 +21,6 @@ class Settings < Datadog::Tracing::Contrib::Configuration::Settings
 
             option :service_name do |o|
               o.default { Datadog.configuration.service_without_fallback || Ext::SERVICE_NAME }
-              o.lazy
             end
 
             option :operation_name do |o|
diff --git a/lib/datadog/ci/contrib/minitest/configuration/settings.rb b/lib/datadog/ci/contrib/minitest/configuration/settings.rb
index 52970f2799d..e6f600d9652 100644
--- a/lib/datadog/ci/contrib/minitest/configuration/settings.rb
+++ b/lib/datadog/ci/contrib/minitest/configuration/settings.rb
@@ -12,7 +12,11 @@ module Configuration
           # TODO: mark as `@public_api` when GA
           class Settings < Datadog::Tracing::Contrib::Configuration::Settings
             option :enabled do |o|
-              o.default { env_to_bool(Ext::ENV_ENABLED, true) }
+              o.env_var Ext::ENV_ENABLED
+              o.default true
+              o.setter do |value|
+                val_to_bool(value)
+              end
             end
 
             option :service_name do |o|
@@ -20,7 +24,8 @@ class Settings < Datadog::Tracing::Contrib::Configuration::Settings
             end
 
             option :operation_name do |o|
-              o.default { ENV.key?(Ext::ENV_OPERATION_NAME) ? ENV[Ext::ENV_OPERATION_NAME] : Ext::OPERATION_NAME }
+              o.env_var Ext::ENV_OPERATION_NAME
+              o.default Ext::OPERATION_NAME
             end
           end
         end
diff --git a/lib/datadog/ci/contrib/rspec/configuration/settings.rb b/lib/datadog/ci/contrib/rspec/configuration/settings.rb
index f75f8010746..3ced02447a6 100644
--- a/lib/datadog/ci/contrib/rspec/configuration/settings.rb
+++ b/lib/datadog/ci/contrib/rspec/configuration/settings.rb
@@ -21,12 +21,11 @@ class Settings < Datadog::Tracing::Contrib::Configuration::Settings
 
             option :service_name do |o|
               o.default { Datadog.configuration.service_without_fallback || Ext::SERVICE_NAME }
-              o.lazy
             end
 
             option :operation_name do |o|
               o.env_var Ext::ENV_OPERATION_NAME
-              o.default ENV[Ext::OPERATION_NAME]
+              o.default Ext::OPERATION_NAME
             end
           end
         end
diff --git a/lib/datadog/core/configuration/base.rb b/lib/datadog/core/configuration/base.rb
index aed35c384f3..b8bc0476c17 100644
--- a/lib/datadog/core/configuration/base.rb
+++ b/lib/datadog/core/configuration/base.rb
@@ -28,7 +28,7 @@ def settings(name, &block)
             settings_class = new_settings_class(&block)
 
             option(name) do |o|
-              o.default { settings_class.new }
+              o.default settings_class.new
 
               o.resetter do |value|
                 value.reset! if value.respond_to?(:reset!)
diff --git a/lib/datadog/core/configuration/settings.rb b/lib/datadog/core/configuration/settings.rb
index aca7f7ea12d..bd60b7a66cd 100644
--- a/lib/datadog/core/configuration/settings.rb
+++ b/lib/datadog/core/configuration/settings.rb
@@ -80,8 +80,6 @@ def initialize(*_)
         # @return [String,nil]
         option :api_key do |o|
           o.env_var Core::Environment::Ext::ENV_API_KEY
-          o.default { nil }
-          o.lazy
         end
 
         # Datadog diagnostic settings.
@@ -432,7 +430,7 @@ def initialize(*_)
             end
           end
 
-          option :opts, default: ->(_i) { {} }, lazy: true
+          option :opts, default: ->(_i) { {} }
           option :statsd
         end
 
@@ -446,8 +444,7 @@ def initialize(*_)
 
           # NOTE: service also gets set as a side effect of tags. See the WORKAROUND note in #initialize for details.
           o.env_var Core::Environment::Ext::ENV_SERVICE
-          o.default { Core::Environment::Ext::FALLBACK_SERVICE_NAME }
-          o.lazy
+          o.default Core::Environment::Ext::FALLBACK_SERVICE_NAME
 
           # There's a few cases where we don't want to use the fallback service name, so this helper allows us to get a
           # nil instead so that one can do
@@ -470,8 +467,6 @@ def initialize(*_)
         # @return [String,nil]
         option :site do |o|
           o.env_var Core::Environment::Ext::ENV_SITE
-          o.default { nil }
-          o.lazy
         end
 
         # Default tags
@@ -482,7 +477,7 @@ def initialize(*_)
         # @return [Hash<String,String>]
         option :tags do |o|
           o.env_var Core::Environment::Ext::ENV_TAGS
-          o.default { {} }
+          o.default {}
           o.setter do |new_value, old_value|
             tag_list = if new_value && new_value.is_a?(String)
                          val_to_list(new_value, comma_separated_only: false).each_with_object({}) do |tag, tags|
@@ -520,7 +515,6 @@ def initialize(*_)
             # Merge with previous tags
             (old_value || {}).merge(string_tags)
           end
-          o.lazy
         end
 
         # The time provider used by Datadog. It must respect the interface of [Time](https://ruby-doc.org/core-3.0.1/Time.html).
@@ -533,7 +527,7 @@ def initialize(*_)
         # @default `->{ Time.now }`
         # @return [Proc<Time>]
         option :time_now_provider do |o|
-          o.default { ::Time.now }
+          o.experimental_default_proc { ::Time.now }
 
           o.on_set do |time_provider|
             Core::Utils::Time.now_provider = time_provider
@@ -555,8 +549,6 @@ def initialize(*_)
         option :version do |o|
           # NOTE: version also gets set as a side effect of tags. See the WORKAROUND note in #initialize for details.
           o.env_var Core::Environment::Ext::ENV_VERSION
-          o.default { nil }
-          o.lazy
         end
 
         # Client-side telemetry configuration
diff --git a/lib/datadog/tracing/configuration/settings.rb b/lib/datadog/tracing/configuration/settings.rb
index 0d6a7e97b0d..efebc882ff6 100644
--- a/lib/datadog/tracing/configuration/settings.rb
+++ b/lib/datadog/tracing/configuration/settings.rb
@@ -346,7 +346,6 @@ def self.extended(base)
                       end
                     end
                   end
-                  o.lazy
                 end
               end
 
@@ -366,14 +365,10 @@ def self.extended(base)
                   end
                 end
 
-                option :trace_flush do |o|
-                  o.default { nil }
-                  o.lazy
-                end
+                option :trace_flush
 
                 option :writer_options do |o|
-                  o.default { {} }
-                  o.lazy
+                  o.default {}
                 end
               end
 
@@ -401,7 +396,7 @@ def self.extended(base)
               #
               # @default `{}`
               # @return [Hash,nil]
-              option :writer_options, default: ->(_i) { {} }, lazy: true
+              option :writer_options, default: ->(_i) { {} }
 
               # Client IP configuration
               # @public_api
@@ -432,7 +427,6 @@ def self.extended(base)
                     # ENABLED env var takes precedence over deprecated DISABLED
                     val_to_bool(ENV[Tracing::Configuration::Ext::ClientIp::ENV_ENABLED] || enabled)
                   end
-                  o.lazy
                 end
 
                 # An optional name of a custom header to resolve the client IP from.
@@ -441,8 +435,6 @@ def self.extended(base)
                 # @return [String,nil]
                 option :header_name do |o|
                   o.env_var Tracing::Configuration::Ext::ClientIp::ENV_HEADER_NAME
-                  o.default { nil }
-                  o.lazy
                 end
               end
 
diff --git a/lib/datadog/tracing/contrib/opensearch/configuration/settings.rb b/lib/datadog/tracing/contrib/opensearch/configuration/settings.rb
index 9748c5af25e..c6488c3ea6e 100644
--- a/lib/datadog/tracing/contrib/opensearch/configuration/settings.rb
+++ b/lib/datadog/tracing/contrib/opensearch/configuration/settings.rb
@@ -12,30 +12,39 @@ module Configuration
           # @public_api
           class Settings < Contrib::Configuration::Settings
             option :enabled do |o|
-              o.default { env_to_bool(Ext::ENV_ENABLED, true) }
-              o.lazy
+              o.env_var Ext::ENV_ENABLED
+              o.default true
+              o.setter do |value|
+                val_to_bool(value)
+              end
             end
 
             option :analytics_enabled do |o|
-              o.default { env_to_bool(Ext::ENV_ANALYTICS_ENABLED, false) }
-              o.lazy
+              o.env_var Ext::ENV_ANALYTICS_ENABLED, false
+              o.default false
+              o.setter do |value|
+                val_to_bool(value)
+              end
             end
 
             option :analytics_sample_rate do |o|
-              o.default { env_to_float(Ext::ENV_ANALYTICS_SAMPLE_RATE, 1.0) }
-              o.lazy
+              o.env_var Ext::ENV_ANALYTICS_SAMPLE_RATE
+              o.default 1.0
+              o.setter do |value|
+                val_to_float(value)
+              end
             end
 
             option :quantize, default: {}
 
             option :service_name do |o|
-              o.default do
+              o.env_var Ext::ENV_SERVICE_NAME
+              o.setter do |value|
                 Contrib::SpanAttributeSchema.fetch_service_name(
-                  Ext::ENV_SERVICE_NAME,
+                  value,
                   Ext::DEFAULT_PEER_SERVICE_NAME
                 )
               end
-              o.lazy
             end
           end
         end