collage fixes

README.md

@@ -94,8 +94,9 @@ The template also accepts a raw URL string or standard CasparCG XML
 
 ## Collage
 
-Use `/collage` to render multiple social posts as a vertically scrolling strip.
-Posts are repeated in the track so the motion keeps filling gaps.
+Use `/collage` to render multiple social posts as independently scrolling
+columns. The browser keeps only a small window of live posts per column, removes
+cards after they scroll off the top, and fills new random cards at the bottom.
 
 Repeated `url` parameters:
 
@@ -114,12 +115,15 @@ Useful collage parameters:
 - `spacing`: pixels between a post and anything else, including screen edges and other posts, default `48`.
 - `fade`: optional pixels used to fade posts in/out at the top and bottom edges, default `0`.
 - `columns`: number of post columns, default `3`.
+- `repeatDistance`: minimum pixel distance before the same post can be reused near another live copy, default `900`.
+- `hydrateDelay`: milliseconds between hydrating newly inserted provider embeds, default `180`.
 - `duration`: seconds per scroll loop, default `360`.
-- `repeat`: number of times to repeat the post list in each half of the loop, default `4`.
+- `repeat`: virtual scroll buffer multiplier, default `2`.
 - `shuffle`: `1` to randomize post order on each page load, default `1`.
 
-Collage card width is calculated from `width`, `spacing`, and `columns`,
-then capped at `500px`, so all columns fit within the configured screen width.
+Collage card width is calculated from `width`, `spacing`, and `columns` so the
+columns fill the configured screen width with only the chosen spacing at the
+edges.
 
 ## API