diff --git a/dataframely/_polars.py b/dataframely/_polars.py
index b19bb50..cd58edb 100644
--- a/dataframely/_polars.py
+++ b/dataframely/_polars.py
@@ -41,9 +41,18 @@ def timedelta_matches_resolution(d: dt.timedelta, resolution: str) -> bool:
     return datetime_matches_resolution(EPOCH_DATETIME + d, resolution)
 
 
-def collect_if(lf: pl.LazyFrame, condition: bool) -> pl.DataFrame | pl.LazyFrame:
-    """Collect a lazy frame if the original was eager, otherwise return the lazy
-    frame."""
+def collect_if(lf: pl.LazyFrame, condition: bool) -> pl.LazyFrame:
+    """Collect a lazy frame based on `condition`."""
     if condition:
-        return lf.collect()
+        return lf.collect().lazy()
     return lf
+
+
+def collect_all_if(
+    lfs: dict[str, pl.LazyFrame], condition: bool
+) -> dict[str, pl.LazyFrame]:
+    """Collect the lazy frames in the dictionary based on `condition`."""
+    if condition:
+        dfs = pl.collect_all(lfs.values())
+        return {k: v.lazy() for k, v in zip(lfs.keys(), dfs)}
+    return lfs
diff --git a/dataframely/collection/collection.py b/dataframely/collection/collection.py
index d85662f..7583465 100644
--- a/dataframely/collection/collection.py
+++ b/dataframely/collection/collection.py
@@ -31,7 +31,7 @@
 from dataframely._filter import Filter
 from dataframely._native import format_rule_failures
 from dataframely._plugin import all_rules_required
-from dataframely._polars import FrameType, collect_if
+from dataframely._polars import FrameType, collect_all_if
 from dataframely._serialization import (
     SERIALIZATION_FORMAT_VERSION,
     SchemaJSONDecoder,
@@ -605,28 +605,25 @@ class HospitalInvoiceData(dy.Collection):
             result_cls = cls._init(results)
             primary_key = cls.common_primary_key()
 
-            keep: dict[str, pl.LazyFrame] = {}
-            for name, filter in filters.items():
-                keep[name] = (
-                    filter.logic(result_cls)
-                    .select(primary_key)
-                    .pipe(collect_if, eager)
-                    .lazy()
-                )
+            keep = {
+                name: filter.logic(result_cls).select(primary_key)
+                for name, filter in filters.items()
+            }
+            keep = collect_all_if(keep, eager)
 
-            drop: dict[str, pl.LazyFrame] = {}
-            for failure_propagating_member in failure_propagating_members:
-                annotation_column = f"{failure_propagating_member}|failure_propagation"
-                drop[annotation_column] = (
+            drop: dict[str, pl.LazyFrame] = {
+                f"{failure_propagating_member}|failure_propagation": (
                     failures[failure_propagating_member]
                     ._lf.select(primary_key)
                     .unique()
-                    .pipe(collect_if, eager)
-                    .lazy()
                 )
+                for failure_propagating_member in failure_propagating_members
+            }
+            drop = collect_all_if(drop, eager)
 
             # Now we can iterate over the results and left-join onto each individual
-            # filter to obtain independent boolean indicators of whether to keep the row
+            # filter to obtain independent boolean indicators of whether to keep the row.
+            lfs_with_eval: dict[str, pl.LazyFrame] = {}
             for member_name, filtered in results.items():
                 member_info = cls.members()[member_name]
                 if member_info.ignored_in_filters:
@@ -648,7 +645,11 @@ class HospitalInvoiceData(dy.Collection):
                         maintain_order="left",
                     ).with_columns(pl.col(name).fill_null(True))
 
-                lf_with_eval = lf_with_eval.pipe(collect_if, eager).lazy()
+                lfs_with_eval[member_name] = lf_with_eval
+
+            lfs_with_eval = collect_all_if(lfs_with_eval, eager)
+            for member_name, lf_with_eval in lfs_with_eval.items():
+                member_info = cls.members()[member_name]
 
                 # Filtering `lf_with_eval` by the rows for which all joins
                 # "succeeded", we can identify the rows that pass all the filters. We
diff --git a/dataframely/schema.py b/dataframely/schema.py
index c7fc92c..726aa6d 100644
--- a/dataframely/schema.py
+++ b/dataframely/schema.py
@@ -754,8 +754,8 @@ def filter(
             match_to_schema, cls, casting=("lenient" if cast else "none")
         )
         if rules := cls._validation_rules(with_cast=cast):
-            evaluated = (
-                lf.pipe(cls._with_evaluated_rules, rules).pipe(collect_if, eager).lazy()
+            evaluated = lf.pipe(cls._with_evaluated_rules, rules).pipe(
+                collect_if, eager
             )
             filtered = evaluated.filter(pl.col(_COLUMN_VALID)).select(
                 cls.column_names()