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How to Fix Slow Email Typing and PDF Display Issues in iOS
Question details
The user experiences extreme keyboard lag and unexpected full-document inline rendering when attaching PDFs to emails after updating to iOS 11.2.
- Product
- iOS Mail App
- Device & OS
- iOS 11.2
- Scenario
- Typing a message in the default email app while a PDF file is attached.
- Observed behavior
- Typing becomes extremely slow with a three-second delay after each letter. Additionally, the attached file displays as a full inline document rather than a standard PDF icon.
Verify that your device has an active internet connection and sufficient storage space before attempting any software updates or app reconfigurations.
Update iOS and Restart the Device
Installing the latest system updates can patch known bugs in iOS 11.2 that cause poor attachment rendering and keyboard lag.
Apple frequently releases minor updates to address performance bugs introduced in major iOS rollouts. The slow typing and rendering problem is often linked to how iOS 11.2 processes inline PDF previews.
Restarting the device can also clear temporary system caches that contribute to memory-heavy attachment lag.
Open the Settings app on your iOS device, navigate to 'General', and tap 'Software Update'. If an update is available, follow the on-screen prompts to download and install it.
Press and hold the power button until the 'slide to power off' slider appears. Swipe it to turn off your device. After a few seconds, press and hold the power button again to restart.
Open the Mail app, compose a new message, attach a PDF, and begin typing to see if the delay has been resolved.
Attach the PDF Using the Files App
Sending the PDF directly from the Files app rather than from within the email composer can sometimes bypass the inline rendering bug.
Switch to a Third-Party Email Client
If the native iOS Mail app continues to struggle with PDF inline rendering, using a different email app can offer an immediate workaround.
Use WPS Office to Manage and Share PDFs Without Lag
WPS Office provides robust PDF management features. Instead of attaching heavy files directly to your email—which triggers iOS rendering bugs—you can upload PDFs to WPS Cloud and share them as lightweight links to avoid typing lag entirely.
- 1. Open your PDF in WPS Office: Launch the WPS Office mobile app and open the PDF file you wish to send.
- 2. Access the Share menu: Tap the 'Share' icon located at the bottom of the document viewer.
- 3. Generate a shareable link: Select 'Share as Link' to quickly upload the document to WPS Cloud and generate a unique URL.
- 4. Paste the link into your email: Copy the generated link, open your email app, and paste it into the message body. This bypasses the need for the email app to render the PDF file, guaranteeing smooth typing.
Frequently Asked Questions
Why do PDFs show as full documents instead of icons in iOS Mail?
By default, the iOS Mail app renders single-page PDFs and certain image files inline so the recipient can preview them immediately. While this is an intended feature, software bugs in specific iOS versions can cause rendering errors or system slowdowns.
Can a large PDF attachment cause my keyboard to lag on an iPhone?
Yes. When an email app attempts to display a large or complex PDF inline while you type, it consumes heavy processing power and memory. This lack of resources can lead to noticeable delays between pressing a key and the letter appearing on screen.
How do I stop inline attachments in Apple Mail on iPhone?
iOS does not offer a native toggle to universally disable inline attachments on mobile. However, you can prevent inline previewing by placing your PDF inside a ZIP folder before attaching it, or by sharing the document via a cloud storage link instead.
