diff --git a/defaults.lua b/defaults.lua
index 1eefe2292..396bf842e 100644
--- a/defaults.lua
+++ b/defaults.lua
@@ -1,7 +1,11 @@
 -- number of page turns between full screen refresh
--- default to full refresh on every page turn
+-- default to do a full refresh on every 6 page turns
 DRCOUNTMAX = 6
 
+-- number of pages for hinting
+-- default to pre-rendering 2 pages
+DHINTCOUNT = 2
+
 -- full screen mode, 1 for true, 0 for false
 DFULL_SCREEN = 1
 
@@ -26,6 +30,10 @@ DOUTER_PAGE_COLOR = 0
 -- supported view mode includes: "scroll" and "page"
 DCREREADER_VIEW_MODE = "page"
 
+-- show dimmed area to indicate page overlap in "page" view mode,
+-- default to false
+DSHOWOVERLAP = false
+
 -- koptreader config defaults
 DKOPTREADER_CONFIG_FONT_SIZE = 1.0		-- range from 0.1 to 3.0
 DKOPTREADER_CONFIG_TEXT_WRAP = 0		-- 1 = on, 0 = off
@@ -34,7 +42,7 @@ DKOPTREADER_CONFIG_DETECT_INDENT = 1	-- 1 = enable, 0 = disable
 DKOPTREADER_CONFIG_DEFECT_SIZE = 1.0	-- range from 0.0 to 3.0
 DKOPTREADER_CONFIG_PAGE_MARGIN = 0.10	-- range from 0.0 to 1.0
 DKOPTREADER_CONFIG_LINE_SPACING = 1.2	-- range from 0.5 to 2.0
-DKOPTREADER_CONFIG_RENDER_QUALITY = 0.8	-- range from 0.5 to 1.0
+DKOPTREADER_CONFIG_RENDER_QUALITY = 1.0	-- range from 0.5 to 2.0
 DKOPTREADER_CONFIG_AUTO_STRAIGHTEN = 0	-- range from 0 to 10
 DKOPTREADER_CONFIG_JUSTIFICATION = -1	-- -1 = auto, 0 = left, 1 = center, 2 = right, 3 = full
 DKOPTREADER_CONFIG_MAX_COLUMNS = 2		-- range from 1 to 4
diff --git a/frontend/document/koptinterface.lua b/frontend/document/koptinterface.lua
index 50422d185..1fa2f01a1 100644
--- a/frontend/document/koptinterface.lua
+++ b/frontend/document/koptinterface.lua
@@ -46,6 +46,12 @@ function KoptInterface:createContext(doc, pageno, bbox)
 	-- So there is no need to check background context when creating new context.
 	local kc = KOPTContext.new()
 	local screen_size = Screen:getSize()
+	local lang = doc.configurable.doc_language
+	if lang == "chi_sim" or lang == "chi_tra" or 
+		lang == "jpn" or lang == "kor" then
+		kc:setCJKChar()
+	end
+	kc:setLanguage(lang)
 	kc:setTrim(doc.configurable.trim_page)
 	kc:setWrap(doc.configurable.text_wrap)
 	kc:setIndent(doc.configurable.detect_indent)
@@ -62,8 +68,7 @@ function KoptInterface:createContext(doc, pageno, bbox)
 	kc:setDefectSize(doc.configurable.defect_size)
 	kc:setLineSpacing(doc.configurable.line_spacing)
 	kc:setWordSpacing(doc.configurable.word_spacing)
-	kc:setLanguage(doc.configurable.doc_language)
-	kc:setBBox(bbox.x0, bbox.y0, bbox.x1, bbox.y1)
+	if bbox then kc:setBBox(bbox.x0, bbox.y0, bbox.x1, bbox.y1) end
 	if Dbg.is_on then kc:setDebug() end
 	return kc
 end
@@ -133,12 +138,6 @@ function KoptInterface:getReflewTextBoxes(doc, pageno)
 		if cached then
 			local kc = self:waitForContext(cached.kctx)
 			--kc:setDebug()
-			local lang = doc.configurable.doc_language
-			if lang == "chi_sim" or lang == "chi_tra" or 
-				lang == "jpn" or lang == "kor" then
-				kc:setCJKChar()
-			end
-			kc:setLanguage(lang)
 			local fullwidth, fullheight = kc:getPageDim()
 			local boxes = kc:getWordBoxes(0, 0, fullwidth, fullheight)
 			Cache:insert(hash, CacheItem:new{ rfpgboxes = boxes })
@@ -154,14 +153,8 @@ function KoptInterface:getTextBoxes(doc, pageno)
 	local cached = Cache:check(hash)
 	if not cached then
 		local kc_hash = "kctx|"..doc.file.."|"..pageno
-		local kc = KOPTContext.new()
+		local kc = self:createContext(doc, pageno)
 		kc:setDebug()
-		local lang = doc.configurable.doc_language
-		if lang == "chi_sim" or lang == "chi_tra" or 
-			lang == "jpn" or lang == "kor" then
-			kc:setCJKChar()
-		end
-		kc:setLanguage(lang)
 		local page = doc._document:openPage(pageno)
 		page:getPagePix(kc)
 		local fullwidth, fullheight = kc:getPageDim()
diff --git a/frontend/ui/reader/readerhinting.lua b/frontend/ui/reader/readerhinting.lua
index 1fad17ba1..cc16c0c6e 100644
--- a/frontend/ui/reader/readerhinting.lua
+++ b/frontend/ui/reader/readerhinting.lua
@@ -3,6 +3,21 @@ ReaderHinting = EventListener:new{
 	hinting_states = {}
 }
 
+function ReaderHinting:onHintPage()
+	if not self.view.hinting then return true end
+	for i=1, DHINTCOUNT do
+		if self.zoom.current_page + i <= self.ui.document.info.number_of_pages then
+			self.ui.document:hintPage(
+				self.view.state.page + i,
+				self.zoom:getZoom(self.view.state.page + i),
+				self.view.state.rotation,
+				self.view.state.gamma,
+				self.view.render_mode)
+		end
+	end
+	return true
+end
+
 function ReaderHinting:onSetHinting(hinting)
 	self.view.hinting = hinting
 end
@@ -16,4 +31,4 @@ end
 function ReaderHinting:onRestoreHinting()
 	self.view.hinting = table.remove(self.hinting_states)
 	return true
-end
\ No newline at end of file
+end
diff --git a/frontend/ui/reader/readerpaging.lua b/frontend/ui/reader/readerpaging.lua
index 0ce9c14ee..0df23431c 100644
--- a/frontend/ui/reader/readerpaging.lua
+++ b/frontend/ui/reader/readerpaging.lua
@@ -5,7 +5,7 @@ ReaderPaging = InputContainer:new{
 	number_of_pages = 0,
 	visible_area = nil,
 	page_area = nil,
-	show_overlap_enable = true,
+	show_overlap_enable = DSHOWOVERLAP,
 	overlap = scaleByDPI(20),
 	flip_steps = {0,1,2,5,10,20,50,100}
 }
diff --git a/frontend/ui/reader/readerzooming.lua b/frontend/ui/reader/readerzooming.lua
index d9618f1c8..073818e39 100644
--- a/frontend/ui/reader/readerzooming.lua
+++ b/frontend/ui/reader/readerzooming.lua
@@ -161,19 +161,6 @@ function ReaderZooming:onReZoom()
 	return true
 end
 
-function ReaderZooming:onHintPage()
-	if not self.view.hinting then return true end
-	if self.current_page < self.ui.document.info.number_of_pages then
-		self.ui.document:hintPage(
-			self.view.state.page + 1,
-			self:getZoom(self.view.state.page + 1),
-			self.view.state.rotation,
-			self.view.state.gamma,
-			self.view.render_mode)
-	end
-	return true
-end
-
 function ReaderZooming:getZoom(pageno)
 	-- check if we're in bbox mode and work on bbox if that's the case
 	local zoom = nil
diff --git a/frontend/ui/readerui.lua b/frontend/ui/readerui.lua
index 171283245..699470024 100644
--- a/frontend/ui/readerui.lua
+++ b/frontend/ui/readerui.lua
@@ -173,6 +173,7 @@ function ReaderUI:init()
 		-- hinting controller
 		local hinter = ReaderHinting:new{
 			dialog = self.dialog,
+			zoom = zoomer,
 			view = self[1],
 			ui = self,
 			document = self.document,
diff --git a/frontend/ui/widget/text.lua b/frontend/ui/widget/text.lua
index c063cc1ac..f29a6273b 100644
--- a/frontend/ui/widget/text.lua
+++ b/frontend/ui/widget/text.lua
@@ -153,11 +153,13 @@ function TextBoxWidget:_getVerticalList(alg)
 	-- build horizontal list
 	local h_list = {}
 	for words in self.text:gmatch("[\32-\127\192-\255]+[\128-\191]*") do
-		for w in words:gsplit("%s+", true) do 
-			local word_box = {}
-			word_box.word = w
-			word_box.width = sizeUtf8Text(0, Screen:getWidth(), self.face, w, true).x
-			table.insert(h_list, word_box)
+		for word in words:gsplit("%s+", true) do
+			for w in word:gsplit("%p+", true) do
+				local word_box = {}
+				word_box.word = w
+				word_box.width = sizeUtf8Text(0, Screen:getWidth(), self.face, w, true).x
+				table.insert(h_list, word_box)
+			end
 		end
 	end
 
diff --git a/koreader-base b/koreader-base
index 7266a9276..88c26d984 160000
--- a/koreader-base
+++ b/koreader-base
@@ -1 +1 @@
-Subproject commit 7266a9276b7cb62b44b31291ce54c58cf96005a1
+Subproject commit 88c26d984c3232cdd6d03b19a0da5f6c49351810