Because I often here people saying 'Yoda struggled to lift the X-Wing in Empire,' I feel the need for a counter.
From the original movie, nothing indicates that Yoda is struggling or having a hard time here. He's taking a long time, but he's demonstrating a lesson to Luke that size matters not. His actions are slow & deliberate. Furthermore, nothing indicates he's struggling or having a hard time.
The original script to The Empire Strikes Back, likewise, makes absolutely no reference to Yoda struggling with the X-Wing.

From the original movie, nothing indicates that Yoda is struggling or having a hard time here. He's taking a long time, but he's demonstrating a lesson to Luke that size matters not. His actions are slow & deliberate. Furthermore, nothing indicates he's struggling or having a hard time.




The original script to The Empire Strikes Back, likewise, makes absolutely no reference to Yoda struggling with the X-Wing.
Likewise, the junior novelization of The Empire Strikes Back by Ryder Windham makes absolutely no reference to Yoda struggling.LUKE
(discouraged)
You want the impossible.
Quietly Yoda turns toward the X-wing fighter. With his eyes closed and
his head bowed, he raises his arm and points at the ship.
Soon, the fighter rises above the water and moves forward as Artoo
beeps in terror and scoots away.
The entire X-wing moves majestically, surely, toward the shore. Yoda
stands on a tree root and guides the fighter carefully down toward the
beach.
Luke stares in astonishment as the fighter settles down onto the shore.
He walks toward Yoda.
LUKE
I don't... I don't believe it.
YODA
That is why you fail.
One could say that there's also "no evidence that Yoda didn't struggle," but that is a fallacy that name has slipped my mind. All irrelevant however, as The Empire Strikes Back novelization by Donald F. Glut outright says that Yoda lifted the X-Wing effortlessly.Thoroughly discouraged, Luke said, “You want the impossible.” He got up and started to walk away.
Yoda sighed. Slowly, he bowed his head and closed his eyes. Then he raised his small right hand in the direction of the sunken X-wing.
The starfighter began to rise again.
R2-D2 watched the displaced water flow off the starfighter as it lifted from the swamp. Long strands of moss and weeds dangled from the ship as it rose higher. The little droid began beeping wildly.
Luke heard R2-D2’s cries and turned back. The X-wing was hovering high over the water’s surface. He looked to Yoda, then back to the X-wing.
The ship slowly traveled through the air, then descended to land on an area of moss-covered ground.
Luke examined the starfighter, brushing some muck from its hull to convince himself this wasn’t another hallucination. The X-wing was real, all right. Luke turned back to Yoda. He knelt before the Jedi Master and gasped, “I don’t…I don’t believe it.”
With a touch of sadness in his voice, Yoda said, “That is why you fail.”
So, we have no visual or audio evidence of Yoda struggling to lift the X-Wing, this is not once mentioned in any supplimentary materials that I am aware of, and the novelization outright confirms he did this effortlessly (said novelization IIRC is canon to both the old EU and Disney Canon).Yoda made a grand sweeping gesture to indicate the vastness of the universe about him. “Feel it you must. Feel the flow. Feel the Force around
you. Here,” he said, as he pointed, “between you and me and that tree and that rock.”
While Yoda gave his explanation of the Force, Artoo spun his domed head around, trying without success to register this “Force” on his scanners. He whistled and beeped in bafflement.
“Yes, everywhere,” Yoda continued, ignoring the little droid, “waiting to be felt and used. Yes, even between this land and that ship!”
Then Yoda turned and looked at the swamp, and as he did the water began to swirl. Slowly, from the gently bubbling waters, the nose of the fighter appeared again.
Luke gasped in astonishment as the X-wing gracefully rose from its watery tomb and moved majestically toward the shore.
He silently vowed never to use the word “impossible” again. For there, standing on his tree root pedestal, was tiny Yoda, effortlessly gliding the ship from the water onto the shore. It was a sight that Luke could scarcely believe. But he knew that it was a potent example of Jedi mastery over the Force.
Artoo, equally astounded but not so philosophical, issued a series of loud whistles, then bolted off to hide behind some giant roots.
The X-wing seemed to float onto the beach, and then gently came to a stop.
Luke was humbled by the feat he had witnessed and approached Yoda in awe. “I …” he began, dazzled. “I don’t believe it.”
“That,” Yoda stated emphatically, “is why you fail.”