diff --git a/NATIVE.md b/NATIVE.md
index fcd04ab..a0ca4ba 100644
--- a/NATIVE.md
+++ b/NATIVE.md
@@ -94,8 +94,9 @@ INTO ... ` and before `SELECT`. Settings travel as URL parameters:
 `max_insert_block_size = 1`, `min_insert_block_size_rows = 1`,
 `min_insert_block_size_bytes = 1`, `input_format_parallel_parsing = 0`,
 `max_block_size = 1`, `max_threads = 1`, `max_insert_threads = 1`,
-`async_insert = 0`, and `max_query_size` set to the statement's byte length
-plus 64. The server reads that many bytes before it parses, so the first row
+`async_insert = 0`, `optimize_and_compare_chain = 0`, and `max_query_size`
+set to the statement's byte length plus 64. The server reads that many bytes
+before it parses, so the first row
 after the statement is padding, `tic = 0`, at least 128 bytes, and is filtered
 out. A statement error surfaces on the response only after the body closes,
 so the driver reads the response concurrently and treats an early response as
diff --git a/native/src/resident/mod.rs b/native/src/resident/mod.rs
index b885990..19e5263 100644
--- a/native/src/resident/mod.rs
+++ b/native/src/resident/mod.rs
@@ -15,7 +15,7 @@ pub mod settings;
 pub mod stream;
 pub mod url;
 
-pub use settings::resident_settings;
+pub use settings::{ANALYSIS_SETTINGS, resident_settings};
 pub use stream::{
     CLOSE_TIMEOUT, Endpoint, FIRST_TIC_TIMEOUT, FORMAT_CLAUSE, Resident, ResidentError, TIC_TIMEOUT,
 };
diff --git a/native/src/resident/settings.rs b/native/src/resident/settings.rs
index cc7b809..5020076 100644
--- a/native/src/resident/settings.rs
+++ b/native/src/resident/settings.rs
@@ -8,6 +8,11 @@
 /// transport appends to the statement and the newline after it.
 pub const QUERY_SIZE_SLACK: usize = 64;
 
+/// Settings that change how the server analyses a tic statement. A
+/// resident sends them, and so does a tic statement issued on its own, so
+/// both are analysed the same way.
+pub const ANALYSIS_SETTINGS: [(&str, &str); 1] = [("optimize_and_compare_chain", "0")];
+
 /// Every setting a resident statement needs, for a statement of
 /// `statement_bytes` bytes.
 ///
@@ -16,7 +21,7 @@ pub const QUERY_SIZE_SLACK: usize = 64;
 /// `max_query_size` covers the statement text, which leads the request
 /// body.
 pub fn resident_settings(statement_bytes: usize) -> Vec<(&'static str, String)> {
-    vec![
+    let mut settings = vec![
         ("max_insert_block_size", "1".to_owned()),
         ("min_insert_block_size_rows", "1".to_owned()),
         ("min_insert_block_size_bytes", "1".to_owned()),
@@ -31,7 +36,13 @@ pub fn resident_settings(statement_bytes: usize) -> Vec<(&'static str, String)>
         ),
         ("max_ast_elements", "4000000".to_owned()),
         ("max_expanded_ast_elements", "40000000".to_owned()),
-    ]
+    ];
+    settings.extend(
+        ANALYSIS_SETTINGS
+            .iter()
+            .map(|(name, value)| (*name, (*value).to_owned())),
+    );
+    settings
 }
 
 #[cfg(test)]
diff --git a/native/src/sql/sim/tick.rs b/native/src/sql/sim/tick.rs
index 1f7da74..277adf6 100644
--- a/native/src/sql/sim/tick.rs
+++ b/native/src/sql/sim/tick.rs
@@ -14,6 +14,7 @@
 //! The transform is the same whether it runs inside the resident statement
 //! or over a single row, so a test issues exactly what a session runs.
 
+use crate::resident::ANALYSIS_SETTINGS;
 use crate::sql::Statement;
 
 use super::{Tic, game, hud, lights, mobj, player, spec, specials, state_columns};
@@ -178,6 +179,7 @@ fn stage1_over(db: &str, rows: &[Input], cut: Option<&'static str>) -> Statement
         )
     ))
     .with(&PARSE_SETTINGS)
+    .with(&ANALYSIS_SETTINGS)
 }
 
 /// Building the first statement cut short, for measuring what each of its
@@ -328,7 +330,8 @@ pub fn run_statement(db: &str, rows: &[Input]) -> [Statement; 2] {
             ),
         )
     ))
-    .with(&PARSE_SETTINGS);
+    .with(&PARSE_SETTINGS)
+    .with(&ANALYSIS_SETTINGS);
     [stage1, stage2]
 }
 
@@ -611,6 +614,29 @@ fn row(state: &super::State) -> Vec<(&'static str, String)> {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::resident::resident_settings;
+
+    /// A test's tic statements and a session's residents are analysed
+    /// under the same settings, so a test pays the analysis a session pays.
+    #[test]
+    fn a_test_s_statements_are_analysed_as_a_session_s_are() {
+        let setting = ("optimize_and_compare_chain", "0");
+        let session = resident_settings(0);
+        assert!(
+            session.iter().any(|(n, v)| (*n, v.as_str()) == setting),
+            "a resident session does not send {setting:?}"
+        );
+        let [stage1, stage2] = demo_statement("nat", 1, 2);
+        for (name, statement) in [("first", stage1), ("second", stage2)] {
+            assert!(
+                statement
+                    .settings
+                    .iter()
+                    .any(|(n, v)| (n.as_str(), v.as_str()) == setting),
+                "the {name} statement run_statement builds does not carry {setting:?}"
+            );
+        }
+    }
 
     #[test]
     fn the_resident_statements_read_the_session_s_rows() {
diff --git a/native/src/sql/statement.rs b/native/src/sql/statement.rs
index 7ce21e8..61b4304 100644
--- a/native/src/sql/statement.rs
+++ b/native/src/sql/statement.rs
@@ -23,12 +23,14 @@ impl Statement {
         }
     }
 
-    /// The same statement, to be issued under `settings`.
+    /// The same statement, to be issued under `settings` as well as the
+    /// ones it already has.
     pub fn with(mut self, settings: &[(&str, &str)]) -> Statement {
-        self.settings = settings
-            .iter()
-            .map(|(name, value)| ((*name).to_owned(), (*value).to_owned()))
-            .collect();
+        self.settings.extend(
+            settings
+                .iter()
+                .map(|(name, value)| ((*name).to_owned(), (*value).to_owned())),
+        );
         self
     }