diff --git a/CHANGELOG.md b/CHANGELOG.md
index 280879fa..8fcc1df6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/):
 - New `ind-which-activate` DDS event to change the which component behavior ([#3608])
 - New `hey` DDS event fires when static messages are restored from persistence ([#3725])
 - New `cx.which` API to access the which component state ([#3617])
+- New experimental `ya.co()` API that creates a coroutine ([#1234])
 
 ### Changed
 
diff --git a/yazi-plugin/preset/plugins/folder.lua b/yazi-plugin/preset/plugins/folder.lua
index 20ce681b..761e3d23 100644
--- a/yazi-plugin/preset/plugins/folder.lua
+++ b/yazi-plugin/preset/plugins/folder.lua
@@ -50,50 +50,52 @@ function M:seek(job)
 end
 
 function M:spot(job)
-	self.size, self.last = 0, 0
-	self:spot_multi(job, false)
-
-	local url = job.file.url
-	local it = fs.calc_size(url)
-	while it do
-		local next = it:recv()
-		if next then
-			self.size = self.size + next
-			self:spot_multi(job, false)
-		else
-			break
-		end
+	local i = 0
+	for rows in self:spot_base(job) do
+		i, rows[#rows + 1] = i + 1, ui.Row {}
+		ya.spot_table(
+			job,
+			ui.Table(ya.list_merge(rows, require("file"):spot_base(job)))
+				:area(ui.Pos { "center", w = 60, h = 20 })
+				:row(i == 1 and 1 or nil)
+				:col(1)
+				:col_style(th.spot.tbl_col)
+				:cell_style(th.spot.tbl_cell)
+				:widths { ui.Constraint.Length(14), ui.Constraint.Fill(1) }
+		)
 	end
-
-	local op = fs.op("size", { url = url.parent, sizes = { [url.urn] = self.size } })
-	ya.emit("update_files", { op = op })
-
-	self:spot_multi(job, true)
 end
 
-function M:spot_multi(job, comp)
-	local now = ya.time()
-	if not comp and now < self.last + 0.1 then
-		return
+function M:spot_base(job)
+	local function yield(s)
+		coroutine.yield {
+			ui.Row({ "Folder" }):style(ui.Style():fg("green")),
+			ui.Row { "  Size:", s },
+		}
 	end
 
-	local rows = {
-		ui.Row({ "Folder" }):style(ui.Style():fg("green")),
-		ui.Row { "  Size:", ya.readable_size(self.size) .. (comp and "" or " (?)") },
-		ui.Row {},
-	}
+	return ya.co(function()
+		yield("0B (?)")
 
-	ya.spot_table(
-		job,
-		ui.Table(ya.list_merge(rows, require("file"):spot_base(job)))
-			:area(ui.Pos { "center", w = 60, h = 20 })
-			:row(self.last == 0 and 1 or nil)
-			:col(1)
-			:col_style(th.spot.tbl_col)
-			:cell_style(th.spot.tbl_cell)
-			:widths { ui.Constraint.Length(14), ui.Constraint.Fill(1) }
-	)
-	self.last = now
+		local it, size, last = fs.calc_size(job.file.url), 0, 0
+		if not it then
+			return yield("Error")
+		end
+
+		while true do
+			local next, now = it:recv(), ya.time()
+			if not next then
+				break
+			elseif now >= last + 0.1 then
+				last, size = now, size + next
+				yield(ya.readable_size(size) .. " (?)")
+			else
+				size = size + next
+			end
+		end
+
+		yield(ya.readable_size(size))
+	end)
 end
 
 return M
diff --git a/yazi-plugin/preset/plugins/multi.lua b/yazi-plugin/preset/plugins/multi.lua
index 600092c2..1c3f3b5c 100644
--- a/yazi-plugin/preset/plugins/multi.lua
+++ b/yazi-plugin/preset/plugins/multi.lua
@@ -9,53 +9,55 @@ local selected = ya.sync(function()
 end)
 
 function M:spot(job)
-	self.sum, self.sizes, self.last, self.selected = 0, {}, 0, selected()
-	self:spot_multi(job, false)
-
-	for _, u in ipairs(self.selected) do
-		local it, size = fs.calc_size(u), 0
-		while it do
-			local next = it:recv()
-			if next then
-				size, self.sum = size + next, self.sum + next
-				self:spot_multi(job, false)
-			elseif it.cha.is_dir then
-				self.sizes[u] = size
-				break
-			else
-				break
-			end
-		end
+	local i = 0
+	for rows in self:spot_base(job, selected()) do
+		i = i + 1
+		ya.spot_table(
+			job,
+			ui.Table(rows)
+				:area(ui.Pos { "center", w = 60, h = 20 })
+				:row(i == 1 and 1 or nil)
+				:col(1)
+				:col_style(th.spot.tbl_col)
+				:cell_style(th.spot.tbl_cell)
+				:widths { ui.Constraint.Length(14), ui.Constraint.Fill(1) }
+		)
+		self:update_sizes()
 	end
-
-	self:spot_multi(job, true)
 end
 
-function M:spot_multi(job, comp)
-	local now = ya.time()
-	if not comp and now < self.last + 0.1 then
-		return
+function M:spot_base(_, selected)
+	local function yield(s)
+		coroutine.yield {
+			ui.Row({ "Multi" }):style(ui.Style():fg("green")),
+			ui.Row { "  Size:", s },
+			ui.Row { "  Count:", string.format("%d selected", #selected) },
+		}
 	end
 
-	local rows = {
-		ui.Row({ "Multi" }):style(ui.Style():fg("green")),
-		ui.Row { "  Size:", ya.readable_size(self.sum) .. (comp and "" or " (?)") },
-		ui.Row { "  Count:", string.format("%d selected", #self.selected) },
-	}
+	self.sizes = {}
+	return ya.co(function()
+		yield("0B (?)")
 
-	ya.spot_table(
-		job,
-		ui.Table(rows)
-			:area(ui.Pos { "center", w = 60, h = 20 })
-			:row(self.last == 0 and 1 or nil)
-			:col(1)
-			:col_style(th.spot.tbl_col)
-			:cell_style(th.spot.tbl_cell)
-			:widths { ui.Constraint.Length(14), ui.Constraint.Fill(1) }
-	)
+		local sum, last = 0, 0
+		for _, url in ipairs(selected) do
+			local it, size = fs.calc_size(url), 0
+			while it do
+				local next, now = it:recv(), ya.time()
+				if not next then
+					self.sizes[url] = it.cha.is_dir and size
+					break
+				elseif now >= last + 0.1 then
+					last, size, sum = now, size + next, sum + next
+					yield(ya.readable_size(sum) .. " (?)")
+				else
+					size, sum = size + next, sum + next
+				end
+			end
+		end
 
-	self:update_sizes()
-	self.last = now
+		yield(ya.readable_size(sum))
+	end)
 end
 
 function M:update_sizes()
diff --git a/yazi-plugin/src/utils/sync.rs b/yazi-plugin/src/utils/sync.rs
index b624f542..47cf1e65 100644
--- a/yazi-plugin/src/utils/sync.rs
+++ b/yazi-plugin/src/utils/sync.rs
@@ -12,6 +12,27 @@ use super::Utils;
 use crate::loader::LOADER;
 
 impl Utils {
+	pub(super) fn co(lua: &Lua) -> mlua::Result<Function> {
+		lua.create_function(|lua, f: Function| {
+			let thread = lua.create_thread(f)?;
+			lua.create_async_function(move |lua, args: MultiValue| {
+				let thread = thread.clone();
+				async move {
+					loop {
+						let values: MultiValue = thread.resume(&args)?;
+						if let Some(Value::LightUserData(ud)) = values.get(0)
+							&& *ud == Lua::poll_pending()
+						{
+							lua.yield_with::<()>(values).await?;
+						} else {
+							return Ok(values);
+						}
+					}
+				}
+			})
+		})
+	}
+
 	pub(super) fn sync(lua: &Lua) -> mlua::Result<Function> {
 		lua.create_function(|lua, f: Function| {
 			let mut rt = runtime_mut!(lua)?;
diff --git a/yazi-plugin/src/utils/utils.rs b/yazi-plugin/src/utils/utils.rs
index 32936581..3d5db587 100644
--- a/yazi-plugin/src/utils/utils.rs
+++ b/yazi-plugin/src/utils/utils.rs
@@ -50,6 +50,7 @@ pub fn compose(
 			b"spot_widgets" => Utils::spot_widgets(lua)?,
 
 			// Sync
+			b"co" => Utils::co(lua)?,
 			b"sync" => Utils::sync(lua)?,
 			b"async" => Utils::r#async(lua, isolate)?,
 			b"chan" => Utils::chan(lua)?,