diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3e3e10aa8f..58f716d7a9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -72,6 +72,7 @@ jobs:
           --release
           --workspace
           ${{ steps.prepare.outputs.feature-flags }}
+          --features expensive-tests
           -- --ignored
       - name: Verify working directory is clean
         run: git diff --exit-code
diff --git a/zcash_client_sqlite/Cargo.toml b/zcash_client_sqlite/Cargo.toml
index 45e4754523..ff10c0e1b4 100644
--- a/zcash_client_sqlite/Cargo.toml
+++ b/zcash_client_sqlite/Cargo.toml
@@ -127,5 +127,8 @@ transparent-inputs = [
 ## Exposes unstable APIs. Their behaviour may change at any time.
 unstable = ["zcash_client_backend/unstable"]
 
+## A feature used to isolate tests that are expensive to run. Test-only.
+expensive-tests = []
+
 [lib]
 bench = false
diff --git a/zcash_client_sqlite/src/wallet/orchard.rs b/zcash_client_sqlite/src/wallet/orchard.rs
index dbc1d0b68c..40ca5dc43f 100644
--- a/zcash_client_sqlite/src/wallet/orchard.rs
+++ b/zcash_client_sqlite/src/wallet/orchard.rs
@@ -597,6 +597,7 @@ pub(crate) mod tests {
 
     #[test]
     #[ignore] // FIXME: #1316 This requires support for dust outputs.
+    #[cfg(not(feature = "expensive-tests"))]
     fn zip317_spend() {
         testing::pool::zip317_spend::<OrchardPoolTester>()
     }
diff --git a/zcash_client_sqlite/src/wallet/sapling.rs b/zcash_client_sqlite/src/wallet/sapling.rs
index d4a20b245b..efca725044 100644
--- a/zcash_client_sqlite/src/wallet/sapling.rs
+++ b/zcash_client_sqlite/src/wallet/sapling.rs
@@ -603,6 +603,7 @@ pub(crate) mod tests {
 
     #[test]
     #[ignore] // FIXME: #1316 This requires support for dust outputs.
+    #[cfg(not(feature = "expensive-tests"))]
     fn zip317_spend() {
         testing::pool::zip317_spend::<SaplingPoolTester>()
     }
diff --git a/zcash_primitives/Cargo.toml b/zcash_primitives/Cargo.toml
index 69a7d3e131..b8f24b84cf 100644
--- a/zcash_primitives/Cargo.toml
+++ b/zcash_primitives/Cargo.toml
@@ -123,6 +123,9 @@ test-dependencies = [
     "zcash_protocol/test-dependencies",
 ]
 
+## A feature used to isolate tests that are expensive to run. Test-only.
+expensive-tests = []
+
 [lib]
 bench = false
 
diff --git a/zcash_primitives/src/transaction/tests.rs b/zcash_primitives/src/transaction/tests.rs
index 09552226e1..6aa63b29c8 100644
--- a/zcash_primitives/src/transaction/tests.rs
+++ b/zcash_primitives/src/transaction/tests.rs
@@ -62,6 +62,7 @@ fn check_roundtrip(tx: Transaction) -> Result<(), TestCaseError> {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_sprout(tx in arb_tx(BranchId::Sprout)) {
         check_roundtrip(tx)?;
     }
@@ -70,6 +71,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_overwinter(tx in arb_tx(BranchId::Overwinter)) {
         check_roundtrip(tx)?;
     }
@@ -78,6 +80,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_sapling(tx in arb_tx(BranchId::Sapling)) {
         check_roundtrip(tx)?;
     }
@@ -86,6 +89,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_blossom(tx in arb_tx(BranchId::Blossom)) {
         check_roundtrip(tx)?;
     }
@@ -94,6 +98,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_heartwood(tx in arb_tx(BranchId::Heartwood)) {
         check_roundtrip(tx)?;
     }
@@ -119,6 +124,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_future(tx in arb_tx(BranchId::ZFuture)) {
         check_roundtrip(tx)?;
     }
diff --git a/zcash_proofs/Cargo.toml b/zcash_proofs/Cargo.toml
index bac725b723..9b4eb37026 100644
--- a/zcash_proofs/Cargo.toml
+++ b/zcash_proofs/Cargo.toml
@@ -67,6 +67,9 @@ local-prover = ["directories"]
 ## Enables multithreading support for creating proofs.
 multicore = ["bellman/multicore", "zcash_primitives/multicore"]
 
+## A feature used to isolate tests that are expensive to run. Test-only.
+expensive-tests = []
+
 [lib]
 bench = false
 
diff --git a/zcash_proofs/src/circuit/sprout/mod.rs b/zcash_proofs/src/circuit/sprout/mod.rs
index 7adddb0794..4c71e92569 100644
--- a/zcash_proofs/src/circuit/sprout/mod.rs
+++ b/zcash_proofs/src/circuit/sprout/mod.rs
@@ -335,6 +335,7 @@ where
 
 #[test]
 #[ignore]
+#[cfg(feature = "expensive-tests")]
 fn test_sprout_constraints() {
     use bellman::gadgets::test::*;
     use bls12_381::Scalar;