Slow startup issue on MacBook Air running Yosemite

Hi. My mac is starting slowly, taking about a minute. It seems to get held up in the blank screen phase after the power-on self test. It's not a massive issue but is annoying and a solution would be great. Thanks.

Problem description:

Slow startup.

EtreCheck version: 2.2 (132)

Report generated 5/2/15, 1:01 PM

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Click the [Click for details] links for more information about that line.

Hardware Information: ℹ️

MacBook Air (13-inch, Mid 2013) (Verified)

MacBook Air - model: MacBookAir6,2

1 1.3 GHz Intel Core i5 CPU: 2-core

4 GB RAM Not upgradeable

BANK 0/DIMM0

2 GB DDR3 1600 MHz ok

BANK 1/DIMM0

2 GB DDR3 1600 MHz ok

Bluetooth: Good - Handoff/Airdrop2 supported

Wireless: en0: 802.11 a/b/g/n/ac

Battery: Health = Normal - Cycle count = 370 - SN = C0134430337F90MA5

Video Information: ℹ️

Intel HD Graphics 5000

Color LCD 1440 x 900

System Software: ℹ️

OS X 10.10.3 (14D136) - Time since boot: 0:14:16

Disk Information: ℹ️

APPLE SSD SD0128F disk0 : (121.33 GB)

EFI (disk0s1) <not mounted> : 210 MB

Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB

Macintosh HD (disk1) / : 120.11 GB (84.39 GB free)

Encrypted AES-XTS Unlocked

Core Storage: disk0s2 120.47 GB Online

USB Information: ℹ️

Apple Internal Memory Card Reader

Apple Inc. BRCM20702 Hub

Apple Inc. Bluetooth USB Host Controller

Thunderbolt Information: ℹ️

Apple Inc. thunderbolt_bus

Gatekeeper: ℹ️

Mac App Store and identified developers

Launch Agents: ℹ️

[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a...plist [Click for support]

Launch Daemons: ℹ️

[loaded] com.adobe.ARMDC.Communicator.plist [Click for support]

[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist [Click for support]

[loaded] com.adobe.fpsaud.plist [Click for support]

[loaded] com.microsoft.office.licensing.helper.plist [Click for support]

User Launch Agents: ℹ️

[loaded] com.google.keystone.agent.plist [Click for support]

[loaded] com.valvesoftware.steamclean.plist [Click for support]

User Login Items: ℹ️

iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

Internet Plug-ins: ℹ️

FlashPlayer-10.6: Version: 17.0.0.169 - SDK 10.6 [Click for support]

QuickTime Plugin: Version: 7.7.3

AdobePDFViewerNPAPI: Version: 15.007.20033 - SDK 10.8 [Click for support]

AdobePDFViewer: Version: 15.007.20033 - SDK 10.8 [Click for support]

Flash Player: Version: 17.0.0.169 - SDK 10.6 [Click for support]

Default Browser: Version: 600 - SDK 10.10

SharePointBrowserPlugin: Version: 14.4.9 - SDK 10.6 [Click for support]

Silverlight: Version: 5.1.30317.0 - SDK 10.6 [Click for support]

Safari Extensions: ℹ️

WOT

StartPage HTTPS

3rd Party Preference Panes: ℹ️

Flash Player [Click for support]

Time Machine: ℹ️

Time Machine not configured!

Top Processes by CPU: ℹ️

5% WindowServer

2% fontd

1% Google Chrome Helper(6)

1% taskgated

0% Google Chrome

Top Processes by Memory: ℹ️

741 MB Google Chrome Helper(6)

425 MB kernel_task

152 MB Google Chrome

90 MB mdworker(6)

66 MB mds_stores

Virtual Memory Information: ℹ️

977 MB Free RAM

3.04 GB Used RAM

0 B Swap Used

Diagnostics Information: ℹ️

May 2, 2015, 12:46:20 PM Self test - passed

May 2, 2015, 12:27:29 PM /Users/[redacted]/Library/Logs/DiagnosticReports/com.apple.photomoments_2015-05 -02-122729_[redacted].crash

Apr 30, 2015, 02:41:50 PM /Library/Logs/DiagnosticReports/BitdefenderVirusScanner_2015-04-30-144150_[reda cted].cpu_resource.diag [Click for details]