Performance optimisations:

In-line expressions are faster than function calls

libs/core/luasrc/ltn12.lua

@@ -190,7 +190,7 @@ function source.rewind(src)
             if not chunk then return src()
             else return chunk end
         else
-            table.insert(t, chunk)
+            t[#t+1] = chunk
         end
     end
 end
@@ -277,7 +277,7 @@ end
 function sink.table(t)
     t = t or {}
     local f = function(chunk, err)
-        if chunk then table.insert(t, chunk) end
+        if chunk then t[#t+1] = chunk end
         return 1
     end
     return f, t

libs/core/luasrc/util.lua

@@ -249,9 +249,9 @@ function split(str, pat, max, regex)
 		local s, e = str:find(pat, c, not regex)
 		max = max - 1
 		if s and max < 0 then
-			table.insert(t, str:sub(c))
+			t[#t+1] = str:sub(c)
 		else
-			table.insert(t, str:sub(c, s and s - 1))
+			t[#t+1] = str:sub(c, s and s - 1)
 		end
 		c = e and e + 1 or #str + 1
 	until not s or max < 0
@@ -334,7 +334,7 @@ function combine(...)
 	local result = {}
 	for i, a in ipairs(arg) do
 		for j, v in ipairs(a) do
-			table.insert(result, v)
+			result[#result+1] = v
 		end
 	end
 	return result
@@ -371,7 +371,7 @@ function keys(t)
 	local keys = { }
 	if t then
 		for k, _ in kspairs(t) do
-			table.insert( keys, k )
+			keys[#keys+1] = k
 		end
 	end
 	return keys
@@ -568,7 +568,7 @@ function _sortiter( t, f )
 	local keys = { }
 
 	for k, v in pairs(t) do
-		table.insert( keys, k )
+		keys[#keys+1] = k
 	end
 
 	local _pos = 0
@@ -657,7 +657,7 @@ function execl(command)
 	while true do
 		line = pp:read()
 		if (line == nil) then break end
-		table.insert(data, line)
+		data[#data+1] = line
 	end
 	pp:close()
 

libs/uci/luasrc/model/uci.lua

@@ -88,7 +88,7 @@ function Cursor.delete_all(self, config, stype, comparator)
 	local function helper (section)
 
 		if not comparator or comparator(section) then
-			table.insert(del, section[".name"])
+			del[#del+1] = section[".name"]
 		end
 	end
 
@@ -201,14 +201,14 @@ function Cursor._affected(self, configlist)
 			function(section)
 				if section.affects then
 					for i, aff in ipairs(section.affects) do
-						table.insert(deps, aff)
+						deps[#deps+1] = aff
 					end
 				end
 			end)
 		
 		for i, dep in ipairs(deps) do
 			for j, add in ipairs(_resolve_deps(dep)) do
-				table.insert(reload, add)
+				reload[#reload+1] = add
 			end
 		end
 		
@@ -219,7 +219,7 @@ function Cursor._affected(self, configlist)
 	for j, config in ipairs(configlist) do
 		for i, e in ipairs(_resolve_deps(config)) do
 			if not util.contains(reloadlist, e) then
-				table.insert(reloadlist, e)
+				reloadlist[#reloadlist+1] = e
 			end
 		end
 	end

libs/web/luasrc/template.lua

@@ -63,7 +63,7 @@ function compile(template)
 
 	-- Search all <% %> expressions
 	local function expr_add(ws1, skip1, command, skip2, ws2)
-		table.insert(expr, command)
+		expr[#expr+1] = command
 		return ( #skip1 > 0 and "" or ws1 ) .. 
 		       "<%" .. tostring(#expr) .. "%>" ..
 		       ( #skip2 > 0 and "" or ws2 )