diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index ef1f442..d570031 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -169,4 +169,4 @@ jobs:
             cmake -B ${{github.workspace}}/build -GNinja
             cd build
             cmake --build . --config Release
-            ./oaknut-tests -d yes
+            ./oaknut-tests -d yes "~[slow]"
diff --git a/tests/basic.cpp b/tests/basic.cpp
index 2e29838..1037f3e 100644
--- a/tests/basic.cpp
+++ b/tests/basic.cpp
@@ -77,7 +77,7 @@ TEST_CASE("Fibonacci")
     REQUIRE(fib(9) == 34);
 }
 
-TEST_CASE("Immediate generation (32-bit)")
+TEST_CASE("Immediate generation (32-bit)", "[slow]")
 {
     CodeBlock mem{4096};
 
@@ -97,7 +97,7 @@ TEST_CASE("Immediate generation (32-bit)")
     }
 }
 
-TEST_CASE("Immediate generation (64-bit)")
+TEST_CASE("Immediate generation (64-bit)", "[slow]")
 {
     CodeBlock mem{4096};
 
@@ -117,7 +117,7 @@ TEST_CASE("Immediate generation (64-bit)")
     }
 }
 
-TEST_CASE("ADR")
+TEST_CASE("ADR", "[slow]")
 {
     CodeBlock mem{4096};
 
@@ -143,7 +143,7 @@ TEST_CASE("PageOffset")
     REQUIRE(PageOffset<21, 12>::encode(0x0000000088e74000, 0xffffffffd167dece) == 0xd2202);
 }
 
-TEST_CASE("ADRP")
+TEST_CASE("ADRP", "[slow]")
 {
     CodeBlock mem{4096};
 
@@ -166,7 +166,7 @@ TEST_CASE("ADRP")
     }
 }
 
-TEST_CASE("ADRL")
+TEST_CASE("ADRL", "[slow]")
 {
     CodeBlock mem{4096};
 
@@ -188,7 +188,7 @@ TEST_CASE("ADRL")
     }
 }
 
-TEST_CASE("MOVP2R")
+TEST_CASE("MOVP2R", "[slow]")
 {
     CodeBlock mem{4096};